I would add Doc didn't inherit a fine tuned engine that Pruett got and Pruett did adjust much better and faster than Doc, which is very rare.
Doc had to put his kind of players in first before he could win and in year 2 he actually won. Which isn't easy to do.
One can also speculate how Pruett would have done for 2 more years when the NCAA sanctions set in. He left before they came and really affected us.
Its easy to say Pruett was better because he got a very good team already, never had to re-build, and was in the MAC. Doc had to completely overhaul the team he got.
That "finely tuned engine" that Pruett inherited had just lost twice to 1-AA teams, and then beat UT Chattanooga by 3, beat the Citadel by 2, and beat Hofstra by 2. The very next year with Pruett no one got closer than 14 points to beating the Herd and we beat 8 ranked teams in the process.
And no. Holliday did not have to rebuild or overhaul anything. He inherited a 7-6 team that won a bowl game and 3 of those losses were by a total of 12 points.
What really happened is that Marshall University "inherited" the best football coach in our lifetime and his name is Bobby Pruett.