Add whatever amount of weight you want, and adjust his height based on how tall he was in his true division. For example, you can make Calderon a light heavyweight, but you can't make him a tall light heavyweight. Put your magically resized "little guy" into any era, at any of the original eight weight classes. Then tell us how you think his career would have progressed. Of course, you take part in a thread this completely silly at your own risk, and I apologize if this is the umpteenth variation on a similar idea.
Not sure about the weird kind of variants of this thread but if we are talking about Bantam and below, it has to be Ricardo Lopez .. PFP in the top 3 of the last 30 years in my opinion, always humble but a beautiful technique and a sensational fighter
Well obviously if you could get Lopez, Benny Leonard or Willie Pep as Middleweights, they would be considered the greatest fighters ever. Smaller weight fighters always have far more technical ability than the heavier guys .. Imagining Benny Leonard or Roberto Duran as Heavyweights is interesting but they were what they were because of the weight they fought at .. If people considered the talents of the great heavyweights like Ali, Louis, Tyson, Marciano and Dempsey as Lightweights, they wouldnt ever win a fight especially Marciano and Dempsey, these guys were brilliant Heavy's but in this thread's hypothetical weight/talent variant they were nothing
The thing about Ricardo Lopez is his 1-2 was a big, big weapon, arguably the best all-round 1-2 in history. If you put him at welter or whatever and he's not a big welter with reach, it can take it away a bit.
This is non realistic. We can't "guess" by doing proportions. Different weights need different abilities...