My main views:
1. What does Elijah have to gain from this? Absolutely nothing.
2. If he wanted to makeup a fake he said/she said story, couldn't he have thought of something much more damaging?
3. We know that DL has a fiery streak. Things can be said in the heat of the moment and exit interviews can get heated as they are very "real" moments.
4. Is what DL said that egregious? No, but if he's denying it then it just makes it look worse. Will we ever truly know if Quin doesn't speak up? No. Hell Quin might legitimately not remember. From the responses in this thread, you can tell white people don't consider that bad to the point that I don't think it would register to many.
At the end of the day you should probably just go ahead and fire DL immediately. He can be replaced and Utah already had shakey race relations. This could do a ton of damage to the org if the story stays in the media.
Best thing would be to own up and apologize. I think most players/people would accept that.