Brady will be 38 next Aug. 3, and his contract is insanely team-friendly — if he is on the Patriots’ roster on the final game of 2014, his salaries for 2015 ($7 million), 2016 ($8 million), and 2017 ($9 million) become fully guaranteed, but at less than half the going rate of top-tier NFL quarterbacks ($20-plus million). That’s cheap money for the Patriots, but it’s also cheap money for a team desperate for a quarterback — like, say, Houston, where the coach (Bill O’Brien) is a close ally. Or, say, Tampa Bay, where the general manager (Jason Licht) used to work for the Patriots and is close with Belichick.