Mickey is not our 5th best defender off the boat. He'll get there fast, but I guarantee you that if started the season playing David Lee half the game and Jordan Mickey half the game, team Mickey would allow more points.
I support the consensus that Smart, Bradley, Johnson, and Crowder are our four best defenders, though I don't think Crowder has an entirely decisive edge over Jerebko or Turner.
I think Kelly Olynyk is our 5th best defensive player, and no I'm not joking. He is a pushover down low, no question, but he has been our most disruptive big in terms of getting steals and keeping opponents from penetrating. He's also been about as effective a shot blocker as anyone we have. That's faint praise, but he's not terrible; he's much more effective than any rookie could possibly be.