I think that he'd do pretty well. He was a great fighter,who had some unlucky breaks. he'd be at least a four division champion. I read somewhere that he used to predict which particular area of the ring where he'd drop an opponent.
I think most people would think he'd destroy everyone. From what I've seen it's clear he has power (the Aussie fighter he drops with a nice left hook) but if it was Langford as he was back then going through all oft odays figthers I say he starts finding it hard past at Light-Heavy. He has a punchers chance against Wlad but I seriously doubt a 5'6 man is going to get past that jab. He does okay but I don't think he would get the same accolades as he does now;we would be able to see all of his shortcomings. No doubt someone will say 'Langford had no shortcomings' but I seriously doubt a 5'6 man could fight from Welter to Heavy nowadays. He'd probably be on the level of a Qawi. But with bigger power.
he would have had some losses , but , IF he'd get only almost half the rematches he got , so you'd see those few loses more than avenged. and by that i mean - for every points loss he'll have about a points win and a stoppage win in return. i see him , with enough opurtunities becoming the man at every weight class from 140 to 175 in his reign in it. well , maybe #2 sometimes (he'll surely find dawson and williams very difficult , to say the least). i also agree he wouldn't have gone beyond 175 (good chance that even no more than 168 , and then dawson will have to come down to him , or else - no dawson problem). the reason why he got above 175 in his days was because he had not enough quality oposition and opurtunities up to 175. i see him as a menacing force from 147 to 160.
If Sam Langford fought today he would start at 154 and end up at light heavy. If a big money fight existed, maybe cruiser. His prime weights would be 160, 168 and 175 and he would rewrite the books. If Langford had the opportunity to capitalize on top training camps, conditioning coaches and a near level playing field the devastation left behind would be astounding.
There were probably more quality heavyweights and cruiserweights around while he was coloured champion than there are now.
I agree that he would end up at LHW, but why do you say he would start at 154? He was able to make 140 as a young man and weight-makin is an area of the sport that has come on in leaps and bounds with isotonics, 24 hour weigh in etc etc. Maybe if he had an amature career and started late. Anyway, he'd be a monster.
He COULD do it, but would he? It would take some absolutely extraordinary vision to move him up to HW given his height/style. Not many would think to do it I don't think.
If he gained weight late in his career like he did in his own era (always a big if) he might have been forced to move up like James Toney was. In that situation expect to see him at cruiseweight at least.
I always felt that Langford's weight ballooned and his training suffered upon Willard's lifting the title. I would expect promoters to be knockin down Sam's door to get him to fight for titles in 2000's, not shutting him out.
Langford was so feared as a finisher that when past his prime and overweight no sensible manager would have wanted to put the champion in against him. They knew better. On the issue of the lowest weight that Langford could have fought at today it is hard to judge. He was basicaly malnourished when he started his boxing career so eith with modern weight making techniques it is not a given that he can be shoe horned into 140 or 147.
I see a guy making 140 in that era, i'm happy he can make it today, as you know. I think 147 would be doable for the teenage Langford, certainly.