It doesn't matter if Nasri isn't fit, we'll just add Kalechi, but if they were both fit i'd add them both in at the expense of Bony (as Kalechi is clearly a better option than him right now)Because when Aguero inevitably gets injured again we'd be left with one striker; a 19 year old lad who has up until this point limited experience at the top level and zero experience of playing in the CL. Don't get me wrong I'd still prefer to start him over Bony but I think it's dangerous leaving us with only two strikers in the squad. We have more than enough cover for Nasri, on the other hand.