Just finished the game, the ending was not satisfying, I hurriedly go this site to read documents and such, also I'm surprised to find the
analysis of rise of porre was exactly as presented in this DS version. I think it's time to re-read the old documents
also, it's just my quick analysis about lost sanctum, perhaps it was brought to explain the presence of dimensional split in CC? We knew there is Dragonopolis in CC (or something like that, made by reptite). If all story in lost sanctum are canon, we might as well say Chrono and his friends contribute the time crash in CC because they helped the reptite to survive.
For dimensional vortex... maybe this one serves as bridge from CT to CC, since CC talking parallel world, not about time. Maybe dimensional vortex will trigger even worse complication than just intermingled world, we never know. Oh also, the entity that was always spoken by the party, could we say it's FATE? (though I'm pretty sure there would be countless theories about this, whether it's Schala, FATE, or maybe just 4th window, since the entity is the player themselves)
also, it's kinda interesting to note that the rise of porre is not shown in the normal ending (which often considered canon, where Chrono marries Marle). But it does appear in the new ending. I think two possibilities:
1. The party can't beat DD, but able to save the future, though Chrono doesnt marry Marle, they live simply as it is, Chrono is not made heir of Guardia. and finally, rise of Porre.
2. The party can't beat DD, they forget the Time Eclipse, and beating the 1999 AD lavos as usual, married, and the event in CC is not happening (and might say this ending is not canonical at all)
I'm always thinking whether Chrono become a royal lineage or not, it's kinda confusing why people possessing super duper awesome magic that could defeat destroyer of the world could be beaten so easily by military power. Maybe we could say, they lost their magic power after beating Lavos?