Lol.
Personally, I don't like the theory that much. I mean, you may have thought of a theory, but then you think up of others. And then in certain places, they clash. Hence came the Grandfather paradox.
Anyway, I see the Planet as the entity, though I don't think it made all the gates. I think it definatly made the Red Gate. They were talking about the entity just a few moments before it appeared, coincidence?
Gaspar said that by having so many people popping through gates, the time space continuim would be destroyed. I don't think the entity would risk that.
After thinking about what Lavos tried to do with the time crash, I started thinking that the gates were all leading to a time where Lavos had alot of influence, except 1000AD.
65,000,000BC - Lavos lands. Pocket dimension created. Incase Lavos dies and needs a fail safe, he can (for example) drag the FF back to here, had he not left it.
12,000BC- Lavos first appears out of his pocket dimension, starting a new one. This is the new fail safe incase he needs a back up plan.
600AD- Lavos is summoned by Magus, but not out of his pocket dimension. Since this is an important time in Lavos' history, a gate is formed.
1000AD- Gate simply caused by 1. Melchior being gated 2. The pendant reacting with a call back or something through time.
1999AD- A time when Lavos exits his pocket dimension for good, but it's still left open. Since the gate leads to seconds before he comes out, then the gate may have been created during leave of his pocket dimension.
2400AD- This gate may have been caused by the entity for certain reasons, because it wanted to show Crono and co their future.
Thoughts?