Syeah, poor gurus...
If it's true that the first Melchior who doesn't remember Crono get's replaced by another Melchior who does remember Crono (due to interference in Zeal), does the first Melchior go to the Tesseract or something?
Also, it probably doesn't mean too much but, at the beginning of the game, when you first meet Marle/Nadia and you go to Melchior, he asks if the girl would sell the pendant. Ofcourse he remembers the pendant, but what would he need that for? Or maybe he saw it and understood that they could change history with it (since he was teleported in another timeline with Lavos' power, or someone else's) and tested them on answering "no"? If you say yes, Marle says no, so maybe he knew they would change history and stuff, maybe he knew that he would see them earlier in Zeal next time or something? I guess it probably doesn't mean that much, but anyway ^^!