Gio is very rarely good. Marchisio and Cacares are the only proper subs that we have in the team. The rest are horrible. Isla, Peluso, Ogbonna, Padoin, Osvaldo, Vucinic, Quags are only good as 2nd substitute because they do decrease our level a lot when the do come in.
We need another marchisio level CM or 2 LWBs and 1 RWB + Immobile at the very least to have a proper rotationable bench and this will only address the 3-5-2 Plan A.
A world class team should Ideally have 3 Game plans. Plan A and B are very similar only with more attacking wingbacks in the 3-5-2 if we are struggling to score and a proper striker to come from the bench. This should be our game plan for teams that we can dominate.
A Plan C for employing against opposition that we can never dominate (Barca, Bayern and the likes) which is basically a parked bus and a fast counter attack.
We have lots of shopping to do.
Chelsea needs another midfielder and two world class strikers to have the flexibility to adapt effectively to any type or level of opposition. I prefer mourinho's way of building teams than Pellegrini's, Rodger's or Pep's.