Jayson Tatum held his exit interview on Sunday, the day after missing the Boston Celtics Game 7 loss to the Philadelphia 76ers with tightness in his left knee.  Here’s everything he said, with additional analysis from me.  On what happened to his knee: “Yeah, just experienced some tightness back there. It was just unfortunate timing, but I guess a little bit to be expected. I was away for 10 ½ months and then I came back and I'm playing every other day and I was playing 36 to 40 minutes. So it's not unusual that something would come up. It was just kind of tough because rehab was just going so well the entire time. I guess it was inevitable at some point that I was going to have to deal with something. And it just kind of came at the worst possible time.” One what changed with his knee between Game 6 and Game 7:  “It was just with the staff and medical team and [trainer] Nick [Sang], they just kind of assessed everything that was going on. And I'm still in the window.…