What is he good at?
Maguire and Bailly have flaws to their game, but they at least have areas where they seem to excel. Hell, even Smalling had some major downsides to his game, but he was fast, strong and very good in the air. I don't know what Lindelof does well. He's slow, he gets pushed aside with ease, he's not strong in the air, for a supposed ball-playing CB he's not particularly great in that area and tends to play the ball to Maguire to be the one who brings the ball out instead. He doesn't seem to have one thing he does well as a reason for getting picked every game.
Bailly is a madman who often does at least one thing per game which makes me exasperated, and I've been a stern critic of his awful aerial ability for a while, but he's preferable at RCB for me. I think I'd even take Matic back there right now. Bailly isn't the answer, and neither is Matic, and I don't even think Maguire is in the longrun, but I just can't see a single positive thing Lindelof contributes.