I mean nobody can predict the future with pin point precision but scouts were rather impressed with him before his injury, he was on his way to being a top 100 prospect after making multiple BA hot sheets.
Scouts who have seen him pitch since he's come back are still impressed with his stuff and he's hitting over 100 MPH.
So yeah, he could be a dud but "who knows" well.... I think he's in a different category than other prosepects. (E.G. most prospect people would probably agree Perales has much larger shot at making the majors next year than Myles Patton) When you have it you have it, not everyone has the ability to go from A to MLB but some do. Payton Tolle didn't even throw a single pitch in A ball the year prior and he ended the year in Boston (same age as Perales).
Also, increasingly, the Red Sox (along with other teams) have become much more aggressive in promoting pitchers. There's a sense that you're just wasting their bullets in the minors.
If he can't find the strike zone he probably won't move as aggresively, but I won't be surprised when he's knocking on the door at the end of next year.