I don’t see the same stuff you do. Mediocre fastball, plus changeup average breaking ball, but hitters in AAA or the majors had no issues making contact on him.
I actually like Borucki as a someone who spends a few years contributing as a 5th starter or someone who comes in to throw 4-5 innings after an opener, but I have a very hard time seeing more than that. Who knows though.