Nope, you forgot that any time travel besides using a time egg is hazardous to the time flow. Why do you think time split when Serge was saved? Going back in time and taking/saving people alters the timeline, hence a new future would come about. Besides, the future Belthasar only knows that they did, he's more callous and scheming than the old, broken down Belthasar in post Day of Lavos 2300AD.
Actually, the time egg would also have been hazerdous had Crono's friends not possesed a clone to replace him with, but that's quibbling. You're right, otherwise.
Irrelevant. Magus is looking through time searching for Schala, that is a stated fact in both games, and even by Masato. Heck, how would Belthasar find someone who is traveling through time aswell -.-
How would Belthesar find him? How does Belthesar plan all of the crazy stuff he plans, what with splitting dimensions, and orchestrating the actions of computer programs and other life forms over thousands of years, even influencing the Planet itself to bring Dinopolis into the Keystone Dimension...so I think it would be a simple task for him to find one shadowmage searching for his sister. Besides, I think you mistunderstood my point: I meant that once found, Magus would stop searching because Belthesar would know where Schala was; I did not mean to imply he would not search at all.
Irrelevant. I'm correcting you. Regardless of what the player wants, Masato intended and had them killed, showing their mortality and that they indeed can be defeated by something weaker than Lavos.
That is not the bloody point to this exercise, as I said already. I am inquiring as to why Belthesar would not seek them out in the reality of the situation, presuming this is something real. It is a thought exercise and as such what the game designers might intend does not matter. Call it a case of me wishing to fill in a minor but nagging blank.
Yup. Why else do you think Belthasar especially had all the events come together to create the Chrono Cross. His main mission is to free Schala. If you kill the TD without saving her, you get the bad ending. Why else do you think the ghosts in Opassa Beach tell Serge to save Schala. Why else do you think Lucca tells Kid that it is important to save the Princess.
Err, see, here's the thing: the Time Devourer is supposed to eat all of space-time. Even if Schala were freed, she would still be subject to that same consumption, technically, if she were not a part of the Time Devourer. As such, he would also worry about the Time Devourer. By freeing Schala, he accomplishes both goals, and thus one would presume he would worry equally.
