I don't think there was anything wrong with our setup. Players just preformed poorly, including Delph who had a MOTM last time out, and had a poor game today. Was more interested in attacking than being a disciplined CM.The aging Yaya who shouldn't have been part of a midfield 2? Let alone a midfield 1? A team set up where we were fortunate to get a result. Silva should have been subbed before Delph was, and, in my opinion, for Fernandinho, to allow Yaya forward. He was doing a hell of a lot better than Silva. Silva had more space and was more direct in the build up to the equalising goal. With him on we had sustained pressure, which lessened after he was subbed. Better is a relative term as he was dire all game.
I'm not saying we should have stayed with a 4-1-5 formation, we shouldn't have needed to use such a daft formation. My point is that Pellegrini set the team up poorly, failed to notice poor performers and made very odd substitutions.
As for your suggestions as to who should have been subbed and for who. I was also of the same opinion. But I'm happy Pelegrini disagreed as his actual sub got a result. Mine and yours on th other hand, may or may have not.
Had he not introduced Sterling. There would have been a massive moan, yet as it turned out, Sterling introduction made us worse.
You can tell most wanted that introduction, coz no one has moaned about it. Yet it turns out it was a bad idea. The point being, ideas are great, but reality often differs.
His subs earned a point in a game where errors would have cost us. Otamendis errors.