And all of that is exactly what I'm trying to avoid with a 15 year old. He was 225 during freshman football. He's still roughly 225 now after throwing shot for indoor, and he's throwing shot for outdoor also. He's a leaner 225 than he was in the fall and he's significantly stronger. He's been able to lift all the way through and not have to cut weight for anything and he's had less wear and tear overall and no injuries. By the fall he will have at least another 10-15 on board and repeat the process. The goal of him being bigger next year than last year, not just churning the same 25 pounds back and forth season to season. The yo-yoing weight isnt good for you anyway, nor are all the things kids do to make weight.
You're also talking about a kid who was a state champion swimmer at age 12 who got fat shamed out of the sport by his coach (who is also his high school's coach) because he's not shaped like a traditional swimmer. Fast forward 2.5 years and he's not a chubby little kid anymore and if he were still in the pool he'd be slaughtering people. IMO he doesn't need another sport that's going to start off by immediately putting him on a scale and telling him to weigh less because that is exactly what would happen. Football is great for him and it's why he likes it. In his own words, "At swim I constantly got crap for being big, at football I get praised for it."