I'd ask, respectfully, that you examine the logic of your response. Are you saying that the same KO deficiencies that left our men's basketball program in disarray also gave us the NC? Are you saying that a coach lacking those deficiencies would have been less likely to pull it off?
Or are you saying that a NC is pot luck and having one in hand is worth the destruction of a basketball program? Aren't JC's three championships proof that winning titles is not pot luck -- that winning titles is what strong programs do? And a strong program is what JC left to KO.
As to guarantees, where is the guarantee that Shabazz might not have led us to the title in 2014 with a competent coach? Where is the guarantee that a strong program, developed by a competent coach, might not by now have won a 5th NC, or a 6th? And be positioned to win more.
To answer the OP's question, I'm sure that JC does question his choice. Not that it was "dumb." It was questionable judgment, influenced more by friendship and good will than by objectivity. Perhaps KO deserved his chance and hence you are right in saying "No regrets." But definitely "second thoughts."