Ok, first off I chose not to read those spoilers and am going for 100% of the game before I get that ending, so please stop right there since others may also wish to avoid spoilers as well. From what you have already revealed though I can say, Time Devourer, Dream Devourer. Two different names, I assume two different creatures. And on the chance that it's thanks to the retranslation that the name is different and they are actually the same creature, it could've been much more powerful than when Serge and that group fought it(Like how Lavos is first summoned at Ocean Palace and extremely strong there where as it isn't as strong in 1999 AD). Not to mention both parties wanted to save Schala, however you need the Chrono Cross to do that so CT team couldn't win of course.
I also support Crono being stronger simply for the fact that compare their Luminaires. Same attack, and yet Crono's is much more powerful. And don't think it's cause Serge's Flying Arrow is just that strong because it wipes the floor with that too. Even then, although it is Serge who defeats gods, the gods he defeats are no match for Lavos whom Crono can turn to mulch so the way I see it, Crono can handle gods. Plus, how do we not know whether Lavos is a god where it comes from? It certainly has that kind of power backing itself up, destroying an entire planet from waking up? Hades has to try to accomplish that whereas Lavos does it by accident.
Secondly, there are certain creatures that the races(often not human)consider to be gods and that's what I mean. Even then, if you want to get really technical about it, Serge wasn't truly fighting loads of gods either. He fought one, that's it.
And on top of all of this, one thing comes to mind, why are we actually claiming these characters defeat gods single handedly? Because they certainly do not do that. Ike has an assload of allies, so claiming him to do it by himself is pretty far fetched since he has a large number of assistants in battle. Serge, even more allies(I believe I don't know everyone in the game, just the gameplay for Fire Emblem)and even if he doesn't have more allies than Ike, he still has a massive number of allies and when playing these games although we can only see the characters we are playing as, going by cutscenes and such are we not to assume all the characters you have aquired in your quest are supposed to be with you? So when ike beats gods, he has well over 30 guys helping him, so of course he slays gods. Serge has 39 people following him everywhere once he's set for TD, whaddya think?
I think that goes to show even more how powerful the Crono cast is, because they fight these equivilant villains, but in even smaller numbers(maybe that's why Serge can beat DD or TD or whatever but not Crono? 40 is more likely than 7), that says something about their strength beating Ozzie Slash and Flea just as easily as Serge and co. do, but with less characters. Because if you really count the gameplay thems but not the cutscene strengths, then we might as well say Sonic the Hedgehog can do it b y going Super Sonic, or Flash from MK VS DC using the cheapest methods possible.
Hell if we did that we could count that little dude from katamari Damacy as being a threat, picking up Crono and burning him in a firey ash to help recreate the universe? That guy's a bastard to Earth, and the King Of All Cosmos is even worse... so why can't you stop playing?!!!!!!!!!!!!