As if Miguel's dominant hand really means anything. Furthermore, it's highly likely that the artists would pay such close attention to hand dominance, considering some art discrepancies in the game, as was mentioned previously in the thread.
I don't think Miguel's Crono, but he does look similar, and it is an interesting theory. I would bet his character was influenced by Crono, sort of like Guile (perhaps Miguel was being proposed to be Crono, but then they scrapped the idea, or decided not to elaborate on it).