What has happened with Theo?

He has none of the shyness and confusion he used have that was indicative of his autism. Lexi said today that her son has autism, but it was hard to tell during his conversation with E.J.  Are the writers gradually moving little Theo away from autism in the hope that one day the viewers will forget about it(like Philips' prosthetic leg) and then they will be free to put him into more complex situations?