Ok I'm sure at some point your assistant manager has come out with the comment "the opposition are controlling the midfield, we should do something to correct this." (I don't remember the exact phrase, but it's along those lines.) When you have a look at your opponents line up you'll find he has 4 midfielders to your 3, 5 to your 4 or 6 to your 5. This points to midfield controlling possession. No prizes for that piece of intelligence. This though is reenforced by how we obtain our possession training bonus. Train 4 midfielders. Bingo. Midfielders control possession! The question is, does it matter whereabouts in midfield they are playing?
If we go back to your original question about playing 3 defenders and then look at another thread in the forum about playing with just 2 DCs ( I think it's titled possession penalty. Sorry don't know how to add links). Then we can even further over populate midfield by playing DC,DC,DML,DMC,DMR,MC,MC,AML,AMR,S. 7 midfielders should secure possession, right?
I'll be honest. I've never played that formation, but thinking about it I'm tempted. How we get possession bonus plus assistant managers comments, and of course, the real world of football. I'll quote Brazilians whilst playing for Spanish clubs because that's what I'm familiar with. Is Marcelo (Real Madrid) or Dani Alves (whilst at Barcelona) a full back, L/RD or a wing back L/RDM? If they're full backs it's 4 defenders, but if they're wing backs then both clubs only played or play with 2 DC.
Yes there's the real world. And yes, there's Top Eleven.
But I'm thinking about a change of formation.