I personally think the second half was as well as we've played all season. Against all logic we engaged them higher up the pitch, Mangala & Otamendi aggressively pushed us forwards, Kolarov was the good Kolarov. Ya Ya powerful, determind on the ball. Fernandinho his aggressive best. We looked good before the subs, after we looked much like our old selves.
Sterling clearly benefits from space, adding Navas and a striker spread their defence, left space for Silva and Toure to plot and pass, Fernandinho to run through.
Will on occasion we get hit on the counter? Yes. Obviously, but Sterling and Navas give the side so much more balance.
For me to get our season back on track I'd stick as close to the formation we finished with as possible. Use De Bruyne as an alternative to Aguero, Bony, Iheancho or Silva.