Watching the highlights from last night, it's absolutely shocking how many of the Celtic highlights happen against John Collins. Gordon Hayward, Jaylen Brown, Jayson Tatum, and even Grant Williams scored so many and so easily against him.
He might be the worst defender in the NBA. He's certainly right up there with Jordan Clarkson, Isaiah Thomas, and Trae Young, but he might be the worst. He's almost definitely the worst big man defender that gets 30+ minutes a game.