I posted something like this elsewhere (and said the same months ago), but basically this:
Hart, Kompany, Yaya, Fern, Silva, Nasri and Aguero are all brilliant. Then we have some good players, some fair ones and some crap. So long as we play the first 7, we win. Play 6 of them, we probably win. Play 5 and it's iffy. Play 4 and we lose. The fair to average players cannot hack it when too many of the A team are missing.
Yesterday, when we started with Hart, Kompany, Silva and Fern not playing, I thought here we go this should be interesting! How fucking right I was. It was a train wreck waiting to happen.