Kahn improves the best. With the frame he has, there's every chance he'll retire having fought at middleweight. People question his chin, but.. as proven, there are ways around it. Plus... we still do not know to what extent not cutting into so much weight has helped him develop punch resistance. The others will pobably stop at welterweight/junior middleweight, unless they aim for "multiple weight titles" glory. Saying all that, at WW I don't think Kahn would beat all 4. But he'd benefit most from... such a transition.
As proven by him or by others? Because he hasnt fought anyone with over a 50% KO rate since he moved up. I agree that he was drained at 135, but Kahn at middleweight? atsch Not for me
Alexander for me. Not sure Bradley would carry the weight very well. As for Khan...he has the height to move upto 147lbs, but at this point...I can't see him holding his own and being successful at the higher weight.
Devon looked great at 140 and he is still young. So couple of more pounds and less weight draining and he could be awesome at 147 - which I suspect will be his peak weight until he gets around 28-29 years old. Khan has the physique to be a natural at 140. I have to see how his seed and power handles it. He is so young that it may do little, in fact it may increase his power because he would not drain himself too much. Bradley definitely, IMHO, would perform the best. Small frame and light puncher. If he had PBF's talent I may say otherwise but he does not. I would lean on Alexander by a nose pass Khan but honestly - they are so young that we will not know how talented they truly are for another 1-2 years.
Khan basing it on his size and reach etc. I refuse to judge the guy on his chin till he gets put down by a puncher at 140.