The issue with Coron will be his lack of size vs ACC 2s. He can flat out shoot the rock. The concerns are will he have problems getting it off vs ACC comp and how many will he give up at the other end? After all Spencer Jennings could shoot with the best of them in open gym.
Based off box scores from last year, I don't think he'll have much trouble getting off shots. I looked at RMU's schedule and it looked like they played 4 high major teams (Xavier, Arkansas, Kentucky, and Providence). In those games he took 26 three pointers (average of 6 per game) and made 50%.
As you suggest, hopefully his defense will be good enough to keep him on the floor for extended periods of time.