Well, Will is only 16 for now, so he's still jailbait.
You raise a really good point, and that is that by the time you get to the level Zach is at, you're part of a pretty tight, closed community. It's kind of like living in a small town. So you're right, in that the rumors are probably already there, and they can already be somewhat damaging.
In reality, Zach has a balancing act to follow here (IMHO). If he's good enough, while still maintaining a reasonable facade of straightness, his teammates will probably ignore the rumors. It's also worth noting that in 2003, even football athletes were more tolerant. But regardless, that's a pretty tough path to walk down, and there isn't a whole lot of room for error.
I'd say that if he maintains his relationship with Will, odds are strongly against him playing football, at least when he's out of college.