Tyson was successful because he fought, at HW, like a lighter weight fighter. Slipping punches, countering, changing angles, etc...are rarely seen at HW and the big guys tend to be dumb as well as slow. At WW, those skills are pretty common among the top guys. In addition they always fight at a faster pace and are much smarter than HWs. There have been numerous short, hard hitting welters; some did well, others did not. None are among the top guys at that weight, except Armstrong and his style was nothing like that of Tyson.
Tyson did not fight well inside, he did his damage on the way in. More often than not, he tied up in close, or accepted being tied up. That would hurt him at welter, where he'd be far more likely to get hit coming in.
The number punching system, and being around people that 'understood' it is pretty irrelevant in and of itself. Unless you think there is an important difference between saying "1-2-3" and saying "jab, right hand, hook." What hurt Tyson was when his reflexes slowed a bit and then he started standing straight up and walking in. At welter, that would make him Larry Barnes.
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