You've raised a good question that only BOC can answer - IMO, the starters
are more important in college ball until you get to tournament ball. You will chew through your relief core without starters going 5-7 innings consistently. I do think it's possible that one of the 1st years (whoever has the best control) might be the closer, but that doesn't mean it can't be multiple closers by committee due to match ups. I also think the set up guys who are more experienced might be called upon to finish games in certain favorable situations.
Sperling was the only pitcher I saw hit over 90 mph (some of that by design) in Fall baseball, and I had a fleeting moment when I thought he might be the closer. Then I recalled his control problems of last year and worried that might get into his head again under pressure.