In a stunning development less than two hours before tip-off, the Boston Celtics ruled star forward Jayson Tatum out for Game 7 with left knee stiffness. With Paul George and Joel Embiid both listed as 'probable' to play in Game 7, it seems the Sixers have a golden opportunity to complete a stunning series upset in the first round of the playoffs. Their approach should not change. Tatum has obviously been available for the entirety of the series up to this point, and the Sixers have done an excellent job scheming their defense to account for both him and Jaylen Brown. So much so, in fact, that Philadelphia has managed to coax Bosotn into fewer 3s and fewer shots at the rim as this series has gone on. Removing Tatum from the equation obviously thins Boston's shot creation. Perhaps as impactful is that it narrows the gap in rebounding prowess between these two teams.…