Honestly I just don't sweat MiLB defensive reports very much. I've seen too many inaccurate reports from all over the place, both ways. DJ Stewart was supposed to be competent. I saw multiple first hand accounts questioning Manny's defense and he was one of the best I've ever seen. Wieters was supposed to be a stud, Caleb Joseph was supposedly a poor defender. Westburg supposedly had limited range. The list goes on and on.
Not saying I discount all of it, I think there are a lot of factors that go into MiLB defense that maybe don't apply as much at the MLB level. Bad fields, bad lighting, and honestly just a general lack of focus. I think it's easy to be a bit non-chalant with your defense when you're at Perdue Stadium in front of 3,000 fans, a little different when you're at OPACY. The focus level has to ratchet up a bit.