The good news: Monday night was proof that the 2019-20 Boston Celtics can be really, really good when fully healthy. The bad news: The 2019-20 Celtics are rarely fully healthy. Monday's 139-107 rout of the Los Angeles Lakers was just the 16th time this season the Celtics' "Big Four" of Kemba Walker, Gordon Hayward, Jayson Tatum and Jaylen Brown have shared the court together.