Just last season, Kevin Durant was viewed as the missing piece for the young Houston Rockets. But with another first-round exit and drama related to the 37-year-old’s burner account, it seemed he was on his way out already. Even the Celtics wanted to offload Jaylen Brown, but not for KD, and that’s why a three-team deal was floated. “Teams have called the Rockets this offseason to check in on not only Sengun but Kevin Durant as well,” reported B…