Wasn't there only one sequel? Regardless, all that you said boiled down to "when you change the past, you don't change your past, you just make another timeline" right? Basically what Future Trunks did. he altered the fate of the other timeline but he did nothing to help his own.
But I dunno, it seems like the whole temporal and spatial workings of the series is up for debate. One reason i wanted to play the games was I saw several topics discussing this very matter. The exact connection between Trigger and Cross seems to play heavily on what you believe about how time travel works here.
Hell some people say the DS version of Trigger I'm playing is a different timeline from the original Trigger.
I think I can already see why fans of Chrono Trigger don't like Cross. Cross is a ~super serious~ game if I'm getting it right. All about existential themes and whatnot. Chrono Trigger seems extremely light-hearted. Fiends chilling at the bar talking about how much they want to eat humans while whacky music plays, now I'm back in super-olden times and just got wasted with a cave woman and Lucca and yeah. Unless this game does a total 180, I don't foresee this game coming close to Contemplate Our Navels.
Not that it isn't enjoyable because it is. Just some of my pondering about the massive divide in the fandom.
As for my report on Trigger, it's fun and all but I'm kinda waiting for the plot to really kick into gear. Sure we have a "goal' in the loosest sense of the term but there's no urgency or drive. We're kinda just wandering about trying to fix the Masamune for some reason. Oh well I guess the reason is so Frog will cheer up but that's still doesn't seem to have anything to do with the larger problem here.
Also I guess it doesn't help I'm kinda ahead of the plot in terms of the whole Lavos situation. The heroes think Magus made it but I know better. Kinda hard not to know the whole deal with Lavos when you hang around RPG boards for years and years.
I'm kinda hoping we meet Magus soon. Maybe then the game will kick into high gear.