Well he isn't getting drafted #5.
Carlos Correa won't ever step foot on the campus, he will be a top 5 pick.
Just looked at one mock draft that had Thompson going in the 2nd round at 84, to TB. If he goes that high he shouldn't come to Miami. He will never get more of a signing than he will right now.
As far as development, 3 years in the minor league > than 3 years playing in college.