I can see why Tyson's style works well at heavyweight with slower taller fighters who don't move well, but do you think that his style would be effective style for a welterweight?
It works at any weight.
There are very few active trainers who know all the nuances, though. And you have to be in exceptional shape to use it because it's a demanding, energy-intensive style.
Juan Diaz is the closest thing to peek a boo since Tyson, at the light weights. He was extremely effective. Conditioning, one of the most well condition Ed athletes in the world. He was fun to watch aka buzzsaw