(I did a search and didn't come up with anything related or similar to this, so hopefully I'm saying something someone else hasn't said yet.)
I was watching the CE walk through, I was at the point of the Darkness Beyond Time dungeon, and started thinking about Chrono Brake/Break. I was thinking, in the DBT, there is no time, or time is broken since all of these many abandoned timelines exist here. Then I thought, Chrono Break = Time Break = Broken Time, and Chrono Brake = Time Slow/Stop = Stopped Time or no time, and came up with this theory: Maybe the third Chrono game is an adventure into the DBT to save Schala, and prevent the events of Chrono Cross.
One thing bad about this though is El Nido wouldn't exist since Belthasar wouldn't cause the Time Crash to save Schala. Or maybe Belthasar had the CT team go to the DBT to save her, but end up failing(would explain their ghost children forms in CC), which made Belthasar resort to the time crash. There's many ways to go with this theory.
Dinopolis could be a Reptite fortress( from the discarded timeline where Reptites killed the apes(like CE has)), that's in the DBT. I don't know why we would go there Idk.
Maybe Dinopolis and Chronopolis are the same building, but of different timelines, and there's something conflicting with the time continuum and Idk, didn't really think this through all the way. Any ideas?