Well, he already said he didn't want to do it that way.
Anyway, I think using Platform behavior to create full on Sonic-style movement, with loops and everything, is pretty much an exercise in futility. Fundamentally it's a completely different style of movement, and you'd have to wrestle with too many factors just to cancel out and overcome the basic Platform behavior itself.
A Sonic engine would more likely have to be 100% custom to work well and properly, and that's not something easy for a beginner to tackle.
Though maybe with the new Custom Movement behavior (or whatever it's called) coming soon, it might make at least doing the controls, speed, and collision easier, if not the loops themselves.