TORONTO — As the NBA season reaches its quarter pole, it no longer is too early to say it is too early. Which leads to the question of: What exactly are we fighting for? While much has been made about the parity (which in this case is a convenient code word for mediocrity) in the middle of the Eastern Conference playoff race, has a harsh reality also arrived? Is anyone catching the Cleveland Cavaliers, or, more to the point, the Boston Celtics? For the Heat, that matters, matters a lot, as they continue to sort out their future with Jimmy Butler, who, at 35, has been all over the map with his play. Until last season’s playoffs, there was the hype of Heat hope of a puncher’s chance against the Celtics no matter the seed. Then came annihilation, albeit with Butler and Terry Rozier sidelined.