I agree if he were to be hungry and feel that he had something to prove. I did not like Lennox when he was on top, however, I respect him for knowing that his time was up. To come back now because some bumbs wanna make a payday I would lose all respect, unless he pulls a "George Foreman" than I would give him all of the props. So with that if he is pissed enough with the dramatic turn for the worst his sports' division has taken since his departure, I would say go for it! :yikes
if Lewis does come back and manages to beat Vitali what an amazing accomplishment that would be. you can say there is nothing left to prove, but there is always something left to prove. You can always enhance your legacy, no matter how good it is.