""football makes you tough" . . . "
Football can provide a different mental approach which can translate well to baseball, especially for a guy who has to mentally work through the the mental challenges which exist as someone moves up each step beyond HS baseball. Tough in football does translate to baseball unless the skills already exist to play both sports.
The mental focus and strength which can be learned from football certainly can translate. I never played HS football.
And I did! That's funny. I love football, but, like I said, I'm skeptical -- baseball players from Japan, Korea, Latin America seem to do just fine without getting football training to teach them mental focus and strength. And the point about the 2015 first-round draft picks applies, too -- that is, those kids are succeeding at the highest level (for their age) without that football training.