Gary Sanchez is now Yankees’ biggest key to catching Red Sox

The Yankees stayed away from signing free-agent stars Bryce Harper and Manny Machado, who wanted too many years and too many dollars. They also didn’t acquire catcher J.T. Realmuto from the Marlins. Not pursuing Realmuto, who ended up with the Phillies, was a strong signal the Yankees believe Gary Sanchez will rebound from a brutal…