I don't see anything that is ailing him as overall preventatives from staying at catcher. That's clearly his best option and his position. He's still very very young. He simply needs experience and a commitment to improving his defensive game, first and foremost. There seems to be a lack of expediency or urgency in the framing/catching component - several just what appear to be 'lazy' (for lack of a better word) efforts. A subtle uptick there in reaction and movement and preparedness would do him worlds of good - how he gets there or if he gets there is obviously on him and the greater coaching staff. The arm, well, at this point in time that one actually concerns me - just as Darrien Miller's arm concerns/ed me behind the dish (tho, I would be remiss if I didn't point out Darrien has improved significantly there in just a year and he's shown he has quite a bit more versatility - DH, 1B, lead-off (!!)). The bat is already a plus attribute quite clearly. The power loss is strange but the stroke is so pure so I don't place too much emphasis there personally. He's a prospect, after all. He has work to do.
And, honestly, more than anything what it does for me is remind me: Jeferson Quero level prospects are extremely rare. Joe Ayrault knew what he had in the first week. And, on the record, he stated (paraphrasing from postgame pod recall): "He's the most complete catching prospect the Brewers have had in quite some time." It's really Quero and then a large gap in talent. And then everyone else. Feliciano is definitely near the top of the that list - he simply needs to continue developing. My two cents.