After reading Mr Bekkler's and Acacia Sgt's current discussion in
one of the CE threads, I felt the urge to chime in here.
My only problem with your Smart Time theory is that it makes the hero's efforts meaningless. By this I mean, if the Entity is controlling where and when they go, then what choice do our heroes have? The same problem is present in Chrono Cross: What choice does Serge have in Belthasar's
roulette? While obviously not perfect, the theories of TB and TTI at least allow the characters (and players?) to make their own decisions by having the Chronoverse follow a set of time laws that (usually) work, instead of having an entity playing an omnipresent role. Having an predetermined "destiny" defeats the purpose of (the) Chrono Trigger.
Perhaps I am focusing too much on your mention of destiny, and missing a greater point. If so, just let me know.