I hope he finds the happy medium that works best for him and us. He is a massive human being and could easily balloon to well over 400lbs if he let himself go. That, I believe would derail any chance he has at being a good NFL player. Money and success can be huge motivators to get in shape and, more importantly, to stay there. But when someone is that big, it isn't really healthy for them to try and stay as thin as possible either. It goes against the natural body process and can be detrimental to his health.
For football purposes I think he needs to find that balance of being able to play well and not do his body any long term harm working too hard trying to stay to "light".
I'm speculating here because I don't know his body but IMHO, at 6'7", I would say anything under 330lbs maybe a little too light for his frame. He could have some success at that weight early on in his career, but I don't his body would hold up in the long run. 360lbs is probably too heavy to be effective very long also.
His best weight maybe more like 345lbs.