You know that Terrell was known for one hand...a long left jab...his rright hand may not have been actually "dysfunctional", but it was extremely "undrused", and in his time he was known as the "one armed bandit" as much as he was known as the "Octopus"..
I've seen a vid of a kickboxer with a withered arm and he KOs his opponent with a devastating headkick. Will post if I find.
...joe lous injured his right hand early in his fight with tommy farr and won it mostly with just his left jab. very good win, as farr was tough. joey maxim injured his right arm ...i don't recall how or when but it might have been at the start of his career or even before. as a result he developed a terrific left jab which he combined with his solid chin and defensive smarts to have a superb career fighting any of the best of the light heavies and heavies of his era.
Chris Byrd's opponent frequently had problems with hands due to his style. Vitali is the most known example, but out of my head I remember Holyfield and Golota complaining about this