your assumption on the entity creating the gates for its own survival might be one of the causes of this problem, later after this post you admit that mother brain could be wrong in her assumptions, no matter how logical they may seem, couldn't Robo also be wrong about his observation that "It is almost as if some entity wanted to relive its past"?
Robo could be wrong, but then Robo has also had four hundred YEARS to think about it, and frankly, why create that scene at all if it was not the truth of what is going on with the Chronoverse? What kind of sense would it make? You know, if you don't do the Fiona's Forest sidequest, in the main ending there's a different set of dialogue where they--Marle and Lucca, essentially propose the same exact thing:
Lucca: I thought Lavos made the ルッカ「ゲートはラヴォスの力で Lucca: We thought the Gates were born from
Gates... 生まれたものと思っていたけど…… Lavos's power, but......
But I guess I was wrong. 今思うと違ってたのかもね。[END] Thinking about it now, we may have been wrong.
Marle: What do you mean? マール「どういう事?[END] Marle: What do you mean?
Lucca: I think a greater force ルッカ「もっと違う…… Lucca: I wonder if another......
wanted us to experience those あたたかく大きな存在が If a great, warm being didn't want to show us
events. いろんな時代を私達に the various eras.
見せたかったんじゃないかな。[END]
Okay, poorly formatted, but you see my point: the creators of the game would not create this scene or the Fiona's Forest scene if it were not meant to be what is really going on with the events! Nothing in the game contradicts this, apart from one line by a crazy corrupted computer program that is eagerly trying to wipe out all organic life.
im reminded of a time in highschool when after another teacher left the classroom a student said "he looks like he is stoned" the teacher started talking about slander while i was thinking the kid had made a simple observation.
just because Robo's observation (that the chain of events that direct the party are similar to that of a dieing person reliving their past), has some logic to it dosn't mean that it is exactly whats realy happening.
And if there was another scene contradicting this that showed the truth then you might have a point, but you don't.
but going along with this whole entity created gates nonsense(in my opinion) have you ever been so ill you felt like you where going to die(this is more of a thought expairment then a question), and having been reduced to morning about your condition? don't you think you would remember some key points in your life at that point? people can get sick to the point in which they think death is around the corner, but they manage to pull through. just because the entity thinks its dieing, dosn't mean it is in actuality "living on barrowed time".
The Planet is dying...what else would having its energy sucked from it by a sentient parasitical lifeform for 65,000,000 years do to it? Again, I don't see what your point is. There is nothing in the series mythos to contradict any of this!
I challenge you to explain to me, then, how the Gates are created, what effect Lavos had on the Planet, and why the events of the game occurred as they did if the Planet's death is not the reality of the situation. Do so with evidence from the game, please, not unfounded speculation.