As far as Doc goes, the guy was backing his player and wanting the story to die. Do I think Doc was making that up, yes. You really are trying to tell me that KG said "You are a cancer to your team and to this league"?! Say that out loud. Who would say that?! Carlton?!
Without stepping into the rest of your dispute, I thought it pretty obvious that the "cancerous to our..." wordage was paraphrase. I think more along the lines of "you a (bleepin) cancer, (bleep). Everywhere you go you get your (bleepin) numbers and yo team sucks. You (bleep) up your team, (bleep), you (bleep) up the whole league."
For what it's worth, he's used that same line of attack (i.e. you get your numbers but you don't help your team) on Corey Maggette for years. Not that much of a stretch that he would go after Villanueva, another scoring-no-defense-overpaid player the same way. If that's what was said.