Bailly and Lindelof as a center back partnership in the PL this season*: 2.12 points per game
Lindelof and Maguire: 1.94
Bailly and Maguire: 2.25
This isn't a coincidence either - Bailly has been here for five seasons, had a whole bunch of different partners, and results have been better with him in the team than without each of those five seasons. The problem isn't that he's "levels below" Lindelof (he's miles better at most things and, at worst, equally bad in the air - Lindelof empirically costs more points by being a lightweight than Bailly does by being out of position), it's that he's made of glass.
Bring in a center back with Bailly's attributes capable of staying fit, stick him next to Maguire, and watch the whole team go up a level.
(other interesting stat: this was Henderson's first PL loss for United in 12 appearances, after picking up 29 points in the first 11. Looking forward to seeing him over a full season)
*typo, that's over their careers at United instead of this season, as I addressed in the next post.