I don’t think it can be argued that Brady has received anything other than elite level coaching while a Patriot, Bellichik is the best right?
Let’s say Brady goes to either the Chargers or Raiders, the two teams I’ve heard speculated about. Would you think Brady could look merely average with a team without as good of coaching and with his age? Would you be surprised if an immobile 40 year old plus qb - greatest ever - suddenly was below average playing for a new team next year?