Vincent Kompany has started a total of 11 games this season out of a total of 23
David Silva has started a total of 11 games this season out of a total of 23
Sergio Aguero has started a total of 12 games this season out of a total of 23
Ultimately, regardless of playing games across 4 competitions, they have effectively started around 50% of fixtures. These are our best 3 footballers at the club. And part of the excellent spine of easily the best team/squad in the PL when everyone fit.
Whilst all teams have to deal with injuries and taking into account how lucky we are to have a strong squad, this is the 'main' reason why we are not dominating the league at present. It isn't the only reason, and Pellegrini absolutely has to take some responsibility in particular for some of the beyond ridiculous tactical decisions and substitutions at times, but we are still close to the top and in all competitions even without our best 3 players for 50% of fixtures.
The reason I think this is the main reason is because its not just the fact that they aren't playing enough, its the recovery time and couple of games needed to get match sharp and in a run of top class form before they get injured again which really impacts on the fluency and fluidity of the team.
For example, how many games have we seen De Bruyne, Sterling, Silva and Aguero play together? De Bruyne one week (in the final 3rd of the pitch) is playing with Navas and Bony, the next week Sterling and Toure and Bony, the next week Aguero and Navas, the next week Silva and Sterling and Bony. We are still competing and winning most games but for sure it is the reason why we aren't where we should be which is top of the leaue by at least 4 or 5 points. Those players need to be playing 80% of games.
This is becoming too regular and I don't know what the solution is. The same key players, and the same types of injury. As others have said, we've become too reliant on them and the recruitment hasn't been strategically competent enough.
Finally, we are vulnerable at times, but thats nothing new under Pellegrini. It was like that during games when we won the title, and last season. We have defeats in us. We have huge defensive errors in us. We have a fragile mentality at times in us. And Pellegrini has nativity in him. These are not new.
Ultimately, we would still be top of the league and dominating the PL even with these variables if those 3 players were playing 16 - 18 games out of 23. Collectively.