I'd say Dooley, just because of his pre-Tennessee resume. It sucked. And at UT, he sucked. Duh.
But then you have Pruitt, who was their 23rd? choice. Literally. And the damage done is unknown, as Cincy had said.
Having a 1-year hire was pretty bad, too, regardless of the record (Kiffin). He dips out after a year by choice - it makes your program look "less than."
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Anyway, plenty of canddiates, lol.