This has been bugging me for a while, and I had hoped that reading through the theories about time travel and paradoxes on this site would help, but they've only compounded my confusion.
If the grandfather paradox doesn't exist in Crono Trigger, where the hell does that leave Magus? It seems as though Magus exists in 600AD, then goes back to the Ocean Palace and Zeal in 12000BC, then his actions cause the younger him to be thrown to 600AD, with absolutely no differences from how it originally happened. Thus it would seem that it is fated for Janus to show up in 600AD, and be raised by Ozzie, eventually becoming the warlock Magus, even though the whole point of Chrono Trigger is that there is no fate.
In short, how does Janus come to 600AD in the original timeline, BEFORE Crono and those starting running through the fourth dimension all willy-nilly?