That depends on how he was handled when he went back. He was sent down to work on his approach at the plate, at least in part. Well if you make a hitter change things, good chance his BA suffers. For example, say he was told to work on recognizing breaking pitches, and was told “di not swing at fastballs unless you have two strikes.” Well, if something like that was going on, of course his numbers will suffer.
Did that happen? No idea, but it’s pretty unlikely they just dumped him in Worcester and said “work it out yourself, kid”…