I agree.You just never know what good leadership and management will do for a person. Croyle had none from his HC while he was at UA. If we could teleport his 18 year old self to present day Alabama, I'd wager he would have had a better work ethic (of course he would never make it otherwise). However, I'd also say that he would face competition at Alabama now unlike anything he faced back then. You are most likely right that he would have chosen FSU in that case.
He has his place in UA history as it is, and I'll remember some of those moments fondly.
I will say this - you put Brodie behind any of the O-lines we've had over the last 5 years, with RB's we've had, with the recievers we've had - we would have seen a LOT of wins. Had he came in and worked hard under CNS, there's no telling how good he could have been. Brodie had the prettiest (and most accurate) long ball of any QB we've had in my lifetime.