What happened was that he was miscast in a part that called for someone half DiFalco's age, or, at least, half the age he appeared to be in TORCH SONG.
Can't really fault the actor. He didn't hire himself. He auditioned and was offered a terrific role in a high profile production. I'd have taken it too and I too couldn't pass for 15, even with Blanche DuBois' lanterns.