Theo John has been better this year than Coleman at A&M in very similar roles. Henry Coleman is 0-1 from behind the 3pt line on the entire season. If he ever develops a decent 3pt shot I'll be upset he transferred and we missed out on such a valuable player. Otherwise I don't really care that he left.
The stats don't bear this out. Coleman has a higher PER, higher rebound rates, more counting stats in every category and has a much bigger role at A&M.
I doubt Coleman would have these same numbers at Duke, but if he and John had the exact same numbers, it's still a loss for Duke. John is a one year rental, who will be gone next year. Coleman would have been a contributing piece for 2 more years.