Most un-dedicated fighters?

[TitoFan]

I'll lump Benitez in with Young as part of a group of fighters that although they accomplished much in different ways they both could have done far more but lost the plot.

I'd have to agree with that. Somewhere between '82-'83 and by the time he lost to Mustafa Hamsho in '83.... Benitez seemed to have lost his focus. It was frustrating for his fans, 'cause he was far, far greater than the way he ended his career.