I can't say I disagree with him maybe being sent down. Only thing I can think of is they don't want to diminish his confidence or make him think they have lost faith. But to me, it's needed, if they're serious about wanting him for long term, that might be the best thing to do. Let'em finish out the year in AAA, maybe call him up in mid September, have him play some winter ball, and come back and see what ya got next year.
I haven't lost faith in him, maybe he's been pressing trying to do too much too soon. But he's just never found it this year and maybe he was rushed and too much was expected too soon.