The Philadelphia 76ers’ defense was always going to be tested in a playoff series against the Boston Celtics. The combination of Jaylen Brown, Gordon Hayward, Kemba Walker and Jayson Tatum is a lot to handle. Now, the Sixers are going to be missing their best perimeter defender in the hyper versatile Ben Simmons, and an important backup wing in Glenn Robinson III for at least 7-10 days due to an oblique muscle strain. The Sixers’ defense is going to be stretched thin to say the least.