Out of all those guys, Acevedo has the highest chance of being an ace. He's got NBA power forward size and throws hard as hell. He definitely needs to keep working on his off speed stuff, which is the one thing holding him back. I think he has a solid shot to be another bullpen stud if starting doesn't work out.
Kaprielian doesn't have as high as of a ceiling as Acevedo, but has a lower floor. He should end up being a major league starter, a 3 or 4 type, as long as he can stay healthy. That's a big issue right now, though.
Clarkin is coming back from elbow issues and is having a decent, but not overwhelmingly good season. He has a good repertoire and is a lefty, but probably isn't an ace. He'll probably start next year in AA and it'll give us a chance to see what he's made of.
Lindgren and Coshow are both bullpen types. Lindgren got derailed by injuries. Otherwise, he might have been up with the big league club right now.
Finley is still young, but his ceiling is probably more as a mid-rotation starter. Still a lot of work to do in the minors, though. Probably won't make the majors until 2019, if he ever does.
As far as names beyond that, Chance Adams is having a fantastic year. He's a bit undersized but he sits in the mid 90s and has success in both high-A and AA this year. I still believe in Severino, too. He needs to refine his offspeed stuff, but he is much better than he played this season in the majors. They need to give him more time at the major league level to work on stuff. His changeup was supposed to be his second best pitch, but it wasn't being used correctly after he got called up.