Hi Ara,
The problem of our insufficient language is ever with us, so bear with me here. I am going to presume that by “soul-mind” you mean “Soul-Mind” where “soul” equates with the individuated spirit within which is a singular part of Source yet forever connected to Source and Mind as the over Mind (as distinct and different from the human mind) or Sovereign Integral in WingMakers terminology, or Over Soul/ aka Oversoul.
While the Oversoul can have lives in many times and dimensions, this is different from our personal spirit's lives and evolution.
For the personal or individuated spirit to evolve and progress upon each death and assimilation of all the frequencies of all lessons and experiences of that lifetime, Source guides the spirit to its next necessary experience.
It is highly unlikely, if not impossible, these will be either in the far past or the far future as Source will see its best course as a logical and coherent progression in all aspects of evolution.
*** It seems it is assumed that a person experiencing a human lifetime is more spiritually advanced than a person who lived 5000 years ago. I stand by my statement that reincarnation is not 'linear' as we think of time. However, maybe there are different 'courses' for different types of 'evolutions'? Now that's a thought isn't it? 
This means that a spirit does not incarnate in a time or situation vastly different from its own evolutionary level.
*** My understanding is that advanced spirits do incarnate into lower evolutionary soul-minds to assist in the evolution of that soul-mind.
The spirit of you and I will therefore not IMO incarnate next in the past because it has had the experiences it needs from the past and -- most importantly -- the frequencies of the planet in the past are not in harmony with the spirits of today.
Simply put, we have evolved beyond the past.
***In this inter dimensional time line reality.
To over simplify the analogy it would be like a NASA space scientist being made to go and live with a tribe in the jungle, which is not only unnecessary it is wasteful: he can better serve at NASA; and the tribesman can better serve in the jungle. Each has their place, so too, the past and future, otherwise evolution would be a chaotic mess.
*** Sometimes the past needs to learn from the future and the future needs to learn from the past.
The same, according to Meier, goes for the future: The future earth is of a higher frequency, more advanced, and our spirits need to evolve up to that level before they can incarnate there.
It would be only a very advanced spirit that could in theory incarnate in our future e.g. a more advanced being in every respect from somewhere else in the cosmos that e.g. came here and accidentally died here; but even that spirit will have to wait for the planet’s frequency to catch up with its own before an incarnation could take place, and as time as such doesn’t matter to Source or the spirit it is a mute point.
*** A spirit is clothed in physical DNA, as long as the two are merged in potential there should not be a problem. All the energies which come together to form one's "bodies" come from creation itself. If an incoming spirit is more advanced then extra "folds" are placed into that person's Being to accommodate that advanced spirit. It is like trying to place a 100 watt light globe into a light socket which can only take 50 watts, the thing blows a fuse, however if you stick the 100 watt globe into a socket which can in potential accommodate an 100 watt globe there is no blow out. As long as the physical and spiritual frequencies merge in potential there is no problem.
This is another reason why intergalactic species do not mix
en mass with other species lower on the evolutionary scale, like on this planet, on an open and free basis: there is so much at stake if something goes wrong.
*** Off World intelligences are very much mixing with the humans on this planet. Not only are they hybridizing their physical DNA with human physical DNA some of those Off World Intelligences are incarnating into the hybrid forms themselves.
The only thing lower on the evolutionary scale here is the 'human soul-mind'. 
It is the parameters of the human soul-mind which are extending (evolving) via merging and interaction with Other Intelligences.
In fact it is for this very reason that the change in our planet's frequency is occurring IMO; because we have some such spirits here waiting, which have enabled the frequency jump to be made earlier than it otherwise would have.
*** Yes this I agree with and goes with what I have stated above.
According to Meier there were over 100,000 such beings on the spaceship that, after mechanical failure, self-destructed over Tunguska in the early twentieth century. These spirits, along with the natural evolution of the planet, have significantly raised the frequency around this planet IMO.
James (of WingMakers, Lyricus, and Event Temples) has also indicated that it is the presence of an influx of souls/spirits from elsewhere in the universe that are essentially responsible for the planetary frequency raising we are about to experience.
***Yes I agree. Elsewhere from 'all' the universe, from all times.
These are very difficult subjects for most to grasp, especially so because we have no scientific proof of them as yet.
IMO the reason people think such future and past incarnations are possible is because we are moving closer to the Sovereign Integral frequency all the time and identifying with it, and
from Its perspective that is how things can appear; but that is because it is beyond this time system and sees and experiences it all as one. We and our individuated spirits are in a different situation -- currently.
*** yes hence why I wrote about inter dimensional time lines where the future, as we would consider it, has already happened and reincarnation not being linear as we know time.
Déjà Vu, IMO only relates to brain activity. It’s a very curious phenomenon, and I once experienced this for an entire afternoon, which was a very uncanny experience, but it relates more to feelings of familiarity and memory in the brain triggering in and causing it. The brain and mind do strange things like this as we know from many reported cases, and especially illnesses (not that déjà vu is an illness) how strange connections in the brain can and do frequently occur. Spirit is immaculately intelligent, because it is guided always by Source, and it never guides itself to experience the same thing twice, just as there are no two spirits identical, no two experiences are identical;
if a human lesson needs learning again there will always be subtle differences at least; exactly the same lesson would likely lead to exactly the same result and a broken record syndrome. Everything living is wonderfully unique in its existence.
***This I agree with.
Nice discussing with you Ara,
Nice to discuss this with you too Chris. It's always nice to read another person's thoughts on the subjects of life. Thank you for taking the time to share with me.
Chris