Good point - I forgot about Ed Davis.
Ed has only played 61 minutes but in that time he's corralled 35% of the available defensive rebounds. Allen is the next highest at 20.1%. Davis' offensive rebound percentage is tied with Love for 2nd on the Cavs behind Allen.
Davis' block percentage is 2.6%, which leads the Cavs. Mobley is second at 2.3%.
Davis is scoring 130 points per 100 shot attempts, which is second to Allen. Davis has no turnovers in 61 minutes. He's also making 83% of his shots at the rim which leads the team.
Whether the Cavs think Lopez would be an upgrade over Davis I don't know. With everybody healthy Davis may not even play if the Cavs want to divide the 96 minutes per game at center and PF between Allen, Mobley, Love, and Wade.