The Masamune was created when the Red Knife was embedded into the Mammon Machine. Let's assume that in the "First" Timeline (the one where Crono hasn't changed anything yet), Melchior was the one who used the Red Knife to try to stop the machine, or at the very least, gave it to someone else to do it. And then, we have the timeline in which Melchior was sealed away, and Crono saved him, obtained the Red Knife, and used it to try and stop the Mammon Machine, creating the Masamune in the process.
Now my question is this: What about the timeline in between?
Think about it: When Magus goes back to 12,000 BC, let's assume that he's the one who told Queen Zeal that Melchior would turn on her, because he didn't want anyone to get in his way to kill Lavos or some other twisted RPG logic (no offence, fellow fans). We all know about Crono going back to 12,000 BC, having his butt handed to him on a silver platter by Dalton's Gollum, and being sent through the Gate, which was sealed immediately afterward by Schala.
So, what happens in this timeline, the one where Melchior's still sealed away, but Crono couldn't save him?
Because Melchior couldn't be there (or give anyone the Red Knife), the knife could never be made into the Masamune. And if the knife was never made into the Masamune, most of what happened in history from 600 AD onwards becomes moot.
So my question, I guess, would be... what happens in that timeline? Since the Masamune was never made, no one could have gotten it and tried to kill Magus off with it. Even assuming in the "first" timeline, where the Masamune was broken, someone tried to stop Magus and failed, we still have Cyrus still alive because he never had the weapon to stand up to Magus. That would mean Glenn never became Frog, and maybe the Mystics even won the war, and 1000 AD would be completely different.
Of course, this is a pretty far-fetched idea, but still, you never know when it comes to alternate timelines. Anyway, that's my question, and I would really like to know if anyone here knows the answer. Thank you for your time.