BoxRec

Jimmy Wilde, the ghost with a hammer in his hand usually gets in the top 10 punches p4p.
Little Jimmy rarely weighed over 7st when he was in his pomp and flattening his opponents.
Nigel Benn is a grade A banger and should be on any list of big hitters.
Artie Levine came the nearest to koing Sugar Ray Robinson and le sucre admitted he was out on his feet when Levine whacked him, although Robbie went on to win.
Charlie White the old lightweight contender came within a whisker of koing Freddie Welsh and Benny Leonard in title fights.He could really punch.
Jock McAvoy got a non title fight with Babe Risko and flattened him in 1 round.
The mob envisaged the title slipping away if the pair should meet for the title and blocked the fight.
It was 1 of 86 ko's that the fearsome Rochdale Thunderbolt would score with his tiny fists.

I've thought for a long time now, that the bigger the fighter the easier it is for them to be KO'd. IMO it's more to do with the reduced ability to to absorb a punch the higher the weight division, rather than the power in the punches coming at them