Yeah, but isn't it the Entity that sort of chooses which survives? And anyways, in 1999 it didn't appear as though much else of the life was of the Entity's liking...I mean, mutants & robots basically. I think there always has to be a prevailing lifeforce for the planet. Either the humans or the Reptites...and since the Reptites were gone and then with Mother Brain wiping out the humans...the Mother Brain & the robots would still be a foreign object or disease, much like Lavos itself.
The Entity choose which species survived? I don't recall that...
Anywho, why would robots be a foreign object to the planet? Their bodies are made from it, just as Human or Reptite bodies are/were. Mother Brain's behavior seems to be no different really than Azala's; both want to eradicate humans through genocide. Should we say that Robo is any less alive than, say, the Nu? While certainly different than biological organisms, Robots seem like they could be the "prevailing lifeforce for the planet" just as well as any other species.
As for mutants, what is so bad about that? Mutation is a necessary component of evolution; the creatures of 2300 might be "mutants," but technically so are humans. Can you drink milk? If so, you're a mutant (the gene that controls the production of lactase normally shuts off after infancy; it is a mutation that it stays on for a creatures entire life).
When's Lavos supposed to be gone?
For that, you'd have to ask Mother Brain. Presumably, like any virus, the original copy dies in the production of its spawn (it is a bit curious that 2300 is the only era in which Lavos cannot appear).
One (me, of course) would say that would be a good place is a good place for the entity to hide.
Hide from what?
And if the DBT is "beyond" time that would infer there is a border, right? The first, and correct, answer is that said place is the end of time.
Actually, the two can be very different things. Consider a 1 dimensional line; it has a beginning and an end. Another line might be separated from the first by a 2 dimensional distance. That 2nd line is "beyond" the first line, but it is neither the beginning nor the end of that 1st line.
And if the EOT is, in fact, the end, then you could easily reverse the situation and say it is the beginning of time, right?
No. The end can be the beginning, but that isn't a certainty. Consider a journey. You begin the journey at point A and end it at point B. Point B is the end, but it certainly is not the beginning.
Remember how Magus(young, I forget the name), Belthazar, Melchior, and Gasper were warped from the throne room of Queen Zeal That would violate the conservation of time caveat presented in the beginning of the game, right?
Janus. And there are three things wrong with that. As V_Translanka pointed out, they used separate gates. As the game illustrates, the conservation of time doesn't always function (as displayed with the large gate that shifts Crono and Co as well as Magus). And finally, that is a bit of a mistranslation. Going off the retranslation (emphasis added):
When you enter a space-time distortion with four or more people who live in different times, the dimensional field distorts...
However, there are many space-time distortions in this place.
There are even those who, like you, appear here aimlessly...
Perhaps something is exerting an effect on all of time...
As the three Guru's and Janus all live in the same time period, the dimensional field wouldn't distort.
Note, however, that in the retranslation, such distortions don't take one automatically to the End of Time. Rather, the field is just distorted. This could result in appearing at the end of time, but this would also explain why Magus and Crono and Co weren't sent to the End of Time.
Anywho, the Entity always seemed to me to be much more... zen-like, in nature. Action through inaction, acceptance of the moment, etc. Thus I'd still maintain that the Entity never planned on using Crono and Co to defeat Lavos.