It would be interesting to hear all those who complain about Lindelof's aerial ability, who they would like to replace him with. Of the most common suggestions, I wouldn't say anyone is an upgrade in the air. Here are aerial wins per game this season:
Kounde 2.9
Lindelof 2.6
Konaté 2.6
Upamecano 2.4
Varane 2.3
Ramos 2.0
Pau Torres 2.0
If we make a list over won aerials in the PL, Lindelof shares position 22 out 49 CBs, so slightly above average by PL standards. (CBs who played more than 10 games).
Bailly > Lindelof in every department, apart from positioning. Bailly is also a better fit for our £80 million captain CB, because he can cover his weaknesses more effectively.
One difference is that we get better result in big matches with Lindelof as CB.
Lindelof has 5 big matches in the PL this season (Chelsea, Liverpool, City, 2x Arsenal). We have 4 clean sheets in those 5 matches and totally conceded 1 goal.
Bailly has played 2 big matches (Tottenham, Leicester) and we conceded 8 goals.
It is obvioulsy not only becasue of Lindelof, but our defence has looked well organised in the big matches he played.