On this day, at least, Ray Allen was the obvious choice among Boston’s Big Three to get the ball with the game on the line. Allen made the winning 3-pointer with less than 3 seconds to play, and finished with 33 points in the Celtics’ 98-95 overtime victory over the Toronto Raptors on Sunday. “A lot has been said about this team, what’s going to happen at the end of games, who’s going to take that…