I too believe that Williams has a chance here. I always thought a mini Joe Louis or a mini Tommy Hearns would have the right style. I'm a fan of Williams but I'm not sure he's in that category. but he would have a better chance than most.
IMO to beat Whittaker you need need 1) precision power punching (like a mini Hearns; possibly Williams) or 2) a swarmer with strength and stamina. if you can make a defensive guy use their defence by throwing leather then you can outhustle him to a decision (Armstrong, Duran) or 3) Another defensive genius who turns it into a chess match (Leonard, Gans, Blackburn) You can't say that Whittaker was greatest h2h LW. There are too many greats at the weight to make an honest assessment. I think that's just nonsense, but he has to be in the mix. It could be him...
Yeah, Whitaker was an awkward stinker. His opponents always claimed that he smelled. Should have taken a shower before entering the ring.
Longest amount of defenses and time span was spent at lightweight. However, I'd say 147. He certainly looked better there over 5 or 6 fights in succession. His best win also comes at the same weight against De La Hoya.