Him playing football would be pretty interesting. Honestly though, I don't think he'd succeed because he hops from one obsession to the other (BBAll, MMA, acting, etc) to ever become good at one. As soon as he started playing football he'd want to do something else. Football takes a lot of dedication, and skill is still more important than pure size/stats.
On the other topic noted in this thread, I have said it before and I'll say it again: Davis' hustle is very deceptive. Where another player can simply run over and pick a ball up, Davis will trip on his own feet, fall down, crawl, and then dive for the ball as it rolls out of bounds. Looks like hustle, but it is not.
If you really think his hustle is all that its cracked up to be, then answer me this: Wouldn't a hustler have gotten and stayed in the appropriate level of physical fitness? The answer is YES, and yet Davis is not where he should be, and therefore is not a true hustler.