You’re right about numbers and maybe I should’ve paraphrased it better but what I meant was that to control a midfield better, you need one pure DM behind two CMs (one being more attacking) which 4-3-3 provides better than 4-2-3-1 does and also that our current 3 is too attacking and not balanced enough to be a controlling midfield as Bruno is basically a second striker playing in no 10 position.
McTominay is normally a CM but currently playing as DM or the more defensive one in the double pivot. Eriksen is good at controlling the game but not the best physically so our physicality, energy and defensive stability suffer with him in the team too. He needs others who’s going to provide the steel, energy and other defensive aspects of the game to be around him.
So, McTominay - Eriksen behind Bruno is far from an ideal midfield 3. For me, Fred - Casemiro - Eriksen is not ideal either as I’d like my most advanced midfielder to get on the scoresheet and assist more than current Eriksen does (Eriksen at Spurs would’ve been great as his G & A numbers were brilliant) but it’s still our best bet right now IMO.