I'd be cautious about him becoming food agressive. I had a lovely NN rooster named Atlas that we ended up culling because he got food aggressive and would attack you if you got close since he associated attacks with us accidentally dropping the feed scoop. And yes, he had free access feed.
Is it actually attacking, or is he just pecking sharply once or twice?
Is it actually attacking, or is he just pecking sharply once or twice?