The article's premise is a huge stretch.
The reality is much simpler. Fulmer was never as good without Cutcliffe. With Cut, Fulmer could contend for the SEC and national titles, Without him, we occasionally had good teams, but we were much more inconsistent. We were close in 2001 and 2003 + 2004 were good seasons, but 2002 and 2005 were bad. Cutcliffe comes back and we immediately improve in 2006 and 2007. Cut leaves and we fall apart in 2008.
The most telling stat IMO is this:
Fulmer's record with Cutcliffe: 86-19
Fulmer's record w/o Cutcliffe: 66-33
In some fairness, Fulmer was right about Clawson being a good coach, but just had bad timing. Clawson's style didn't fit what UT had been doing under Cutcliffe, so it ended up being a poor fit. But in reality, we would probably have been better off waiting 3 years for a transition under Clawson than what we eventually ended up doing.