On your list, based on the players you've put in each, you seem to have categories for '6 type' midfielders, and '10 type' midfielders, but no '8 types' (hope that makes sense, it sounded better in my head).
There are the S/S roles, but I can't help but think that a midfield (using those categories) containing Diaby/Buendia, Barkley/Tielemans and Kamara might be a bit top heavy. There would be huge pressure on Kamara to hold the line and win the ball back on transitions. I guess that is where Dougie was useful, helping out.
If we add another category- CM (8 type), we can only really put McGinn into that category at the moment.
Do we need another all round CM?