I think of a mobile Gary Hollingsworth.
Neither was expected to get the starting job. Hollingsworth got it due to injury to the starter, whereas Sims got it by working his tail off to beat out the presumptive favorite in what just about everybody, including the coaches, viewed as an upset.
Both succeeded beyond anyone's wildest expectations. Truth be told, I bet they exceeded their own.
Both owe a huge part of their success to synergistic relationships with great OCs (Homer Smith for Hollingsworth, Lane Kiffin for Sims). In both relationships, the whole is greater than the sum of the parts.
There are differences. Hollingsworth was surprisingly mobile, but nowhere near in Sims' class.
But Homer Smith cried when he couldn't coach Gary Hollingsworth any more. I bet even the too-cool Kiffin feels a lump in his throat when Blake Sims walks away from their last meeting....which, if there is any justice, will be a celebration in a Dallas steakhouse.