I do not believe that NFL players decided to wrestle because they realized they could dominate in high school. They probably used the tools and skills that wrestling inherently develops to use on the football field such as balance, hand fighting, and fighting for position. I am sure their are plenty of high level football players that wrestled for their high school that did not dominate, just as someone who is very high level in wrestling does not always dominate at football. But the skills they are able to enhance doing multiple sports expands their athletic ability.