I think it’s because we’re trying to find what we thought is the “real” Yuu Otosaka when he himself isn’t sure of his own true personality.
If his powers start dwindling because of his change in personality then I would actually find that a good direction for the show to get into. Hey maybe that’s what Nao’s experiment was all about! Or not. Honestly I have no idea and have nothing to suggest towards it @_@
