I'm looking a match right now, and both players are using the same formation (442 diamond). I don't understand why the away player is winning the possession (44%-56%) when using the same scheme and the home player have also a 2% booster from the stadium.
I thought it was all about the number of midfielders, but looking this now I guess is also about the quality?
I would like to know also which kind of midfielders are relevant for ball possession (MC, DMC, DMR/DML, AMC, AML/AMR)

Anyone knows exactly how it works?

Many thanks