McKenna finds breakthrough moment in Maple Leafs’ comeback thriller

TORONTO — Day by day, game by game, it had been building. The weight of the expectations from a city not long on patience, the glare of the spotlight that comes hand in hand with all that blue-and-white passion. Slowly, steadily, the pressure of the moment took on more heft, hung lower on Gavin McKenna’s shoulders, the critiques of the teenager growing less logical and more absurd by the day. Eight hours before he took the ice for the last tilt of this Toronto Maple Leafs’ homestand, the wunderkind looked resolute as he stood at the back of his club’s…