You seem to be struggling with two posters responding to you. You haven't asked asked Stiff Little wingers a question that's why he hasn't answered you.
As for Sterling there could be many reasons why his form dropped after leaving City maybe he needed better analysts at his new clubs. Maybe he lost pace, maybe he lost heart, maybe he lost interest.
As for why we played so poor last season and coaches and analysts have left I've no idea, but a few of those left i believe joined Liverpool.
I know you dont like stats but here's a couple for you, in the league before Sterling was given the analysts advice i mentioned earlier his he scored a goal every 4.9, in the 3 seasons after that he scored a goal every 1.8 games.
Anyway I'll leave it there as this is detailing this thread.