I was looking up long term AAA players two days ago and found , at least the longest term ones listed, there are a fair numer who were/are best of best in AAA but when they hit the Bigs, either have one great year and that is it , or who just never can fully adjust to the Bigs.
The Twins , Seem, to have had a few of those, to one degree or another, but right now their Minor League boys are just that boys who are, for the most part, a crap-shoot at what the Bigs will do to them or they will do in the Bigs.