we don't know exactly when it developed, so maybe he didn't have much of a chance to complain. plus, every young player wants to play through "minor" pain.
probably went something like this when AJ got out there:
Faedo: it's nothing
AJ: it's messing up your delivery
Faedo: it's nothing. throws a couple pitches
AJ: it's messing up your delivery. you're coming out.