I take issue with this mentality. Agüero's been injured a lot lately, but other than him and Torres, every other attacker we own has had at least one spell of dreadful form in the last year. Sterling has actually had two and Mahrez has basically been in one consistent bad patch since Trump's first bloody impeachment.
Foden is the only player we think deserves to be dropped every time he has a bad game though. With everyone else it's "let them play themselves back into form". Why we have this attitude towards one of our own, but not towards any of the other forwards, is beyond me.