I know people are dying to know what I think about this, so I won't disappoint. The short answer is, its a Jerry Springer he said - she said. I don't think either one of them are telling the truth; they are telling their version of it and the truth, such as it is, is somewhere in the middle.
Having said that, I think Grier is painting an over flattering picture of himself as the quintessential team player who just wanted to do whatever it took to make it right. That seems difficult to believe.
I do think he is probably portraying Old Hee Haw pretty accurately though, and Hee Haw comes across exactly as he does week in and week out. It may turn out, in a bit of irony, that Hee Haw's fate was tied to Grier.