Yeah I agree Lee on Nakamba. The issue is ball retention. Luiz is a funny one with his, quite typical, youthful inconsistency. Good at Burnley, not so at Leicester and as bad as everybody else against Man City.
For me though, 343 or 3511 only works if you keep the ball. Luiz is better at that and with more pace and ability than Nakamba.
Trezuguet works hard and played well at both Leicester and Burnley. He was probably our best player against Man City too, even as a sub. Him, two proper wing backs included, gives us a bit of an out ball at least.