BOSTON — Jaylen Brown is touted as one of the Boston Celtics’ best defenders, but when Friday’s game was on the line, he was comfortably situated on the bench. Upon checking out at 5:22 in the fourth quarter, Brown never returned to the floor in the C’s big 123-116 overtime win over the Toronto Raptors. As such, when Raptors star Kawhi Leonard had the ball, oftentimes it was Marcus Morris guarding him. And ultimately, Morris made the biggest defensive stop of the game. Tied in the fourth quarter and barely a second between the game and shot clock, Leonard handled the ball at the top of the key. Morris closely guarded him, and