What a strange coment. Firstly, Mike Tyson did sprint in training. After his jog, he would finish with a series of sprints, when within 6 weaks of a fight.
He also did box jumps, so yes, he was working on explosive power. Do you honestly think that only track sprinters are the only people who sprint? The sprinters represent a very small section of the amount of people who sprint.
He was just not a good sprinter, and he could not sprint as fast as many basketball players, baseball and football players. That is what he meant. he meant that he was not fast enough for team sports.
If the speed ball work was as effective as what is being suggested, then boxers would be a little faster than what they are.
You say no boxers competed in the sprints in superstars program. All the athletes who competed xcould choose to omit two events from the total program. Boxers rarely did the 100 meters, because they knew they would get soundly beaten by the football players, cricket players and rugby players (of which none did any speed ball work.)
Add it up. Secondly, what sort of newbie, blissfully ignorrant belief do you have, that only people who do sprinting can be fast at sprinting. Some rugby and football players do more sprint work than your average amateur sprinter, but are still not as fast as your average amateur sprinter. There are also people who do no sprinting at all, yet are faster than a lot of people that do. Some weightlifters and a few Karate exponents have been known to cover the 100 meters in a split second over 11 seconds, with no sprint training. There is not a great deal of corralation between how much sprinting you do, and how fast you are.
You probably think Usain Bolt is fast only because he sprints. This is why I dont go on the sprint websites much any more. After 25 years of studying athletics, I still read and hear silly coments.