This!
Yes, McCoy does owe an explanation. In this day and age, what he said could potentially ruin a person career. It's a serious accusation. If he said it in frustration, call Kelly and apologize, and own it. If there's truth to it, what is the evidence? and if there is truth, then it should be dealt with.
And let's face it, if he wasn't a Bill, we'd be roasting him right now—as I'm sure he is getting on 31 other team boards today.