Coincidence I reckon. Most of the boxers coming through in the 80s, 90s and noughties were middle sized, more of the little kids were too intimated to box and the big lads probably into rugby and stuff which had grown. And they started using weights etc so 12stone was about right. I dunno. It's weird though. Even the non-champions were all terrific fighters - Kaylor, Sibbo, Watson, Wharton, Close, Cook, Bomber Graham, Francis, Starie, Eubank Jr, Carr, Brown, Piper, Gent etc.