From my perspective, in my opinion, Fulmer did the most damage to the program in 1992, going behind Majors and Dickey directly to the big money boosters to line up their support for the job once he had the interim head coach title while Majors and Johnn Ward recovered from heart surgery and procedures, creating deep, unacceptable and painful divisions within the the fan base, boosters, donors and sponsors, that still linger today. What might be acceptable in the Corleone or Gambino family business has always been unacceptable on Rocky Top. Big time college athletics does not work that way.
Fulmer's tenure as head coach featured capable coordinators, questionable position coaches, however he hired no one during his coaching career who had head coaching abilities nor sufficient skill sets to lay a foundation for any succession planning, given the manner he elevated himself into the position as head coach. Such that Tennessee is pained by no capable coaching tree from Fulmer's tenure as head coach suitable for top tier competition in a power 5 football conference. None. Zip. Nada.
While the 1998 championship was one of the seasons when all the breaks went Tennessee's way, Tennessee was essentially non competitive against Florida while Manning was here the four years beforehand and afterwards the gap between Tennessee and the top of the conference began to widen as Richt and Saban settled into their chairs atop the divisions.
As other schools continued to upgrade their staffs, facilities, and recruiting framework, Fulmer lost the ability to capture top flight talent in state, from North and South Carolina, Georgia, Louisiana and Florida. While the coaching skill set failings were exposed in 2001 blowing the SEC championship and embarrassed by Kansas State in the Cotton Bowl that year, the game had changed too fast and too far for his coaching skill set to be competitive at the top levels and the recruiting failings were fully confirmed in 2005 when Fulmer could not land in state stars, Michael Oher (Ole Miss) and Patrick Turner (USC), yet, much like the 2001 SEC debacle, no help, game changers, or other coaching or recruiting talent was brought on board to better the cause, the team or the program. Fulmer continued to flail away with losing seasons in 2005 and 2008, boosted by the return of David Cutcliff in 2006 and 2007 after his termination at Ole Miss prior to the relocation in Durham, again with no enhancement of the staff until the failed Dave Clawson experiment in 2008 when there were an abundance of other successful and experienced OC's available, such that in the span of 10 years, the program had gone from championship caliber to middle of the road SEC talent and coaching, while the warning signs had been there all along, but completely ignored, again probably going back to the methodology of how he got the job to begin with. Fulmer claimed "equity in the program", although boosters and donors had to financialy perform every year in a what have you done for me lately routine with no recognition for any dollar that had been thrown into the program previously. Nobody has equity in anything at a public state land grant university.
He was appropriately terminated in 2008, generously compensated and never coached another down in the NFL nor any level of the NCAA and the damage to the Tennessee program remains to this day. In my opinion, he went behind John Currie and Bev Davenport in 2017 as occurred in 1992 to get a job he craved but was not otherwise qualified for and his abilities that eventually destroyed his coaching career and damaged the Tennessee program are fully upon us again to permanently place the football program as a cemented bottom feeder in the SEC.