No subs were used for us in the end. Having said that, Podolski hasn't played in 4 months and Santi has been quite average this season, so its difficult to know what influence they may have had.
Giroud is fantastic but wasteful, we knew that last season. That miss this morning was more difficult than it looked, given the conditions etc, but you'd still expect to perhaps test the keeper from that range. Clinical finishing really can be the difference between winning a title or not come end of the season.
Whilst I like Dzeko, I don't believe City will sell to us (if they are to sell him at all). You usually don't see too many class players being sold to direct rivals/challengers (aside from us selling RvP last season). And that's why Jose pulled the pin on the Ba loan move after we signed Ozil.
If we are going to buy another striker, it would likely be from outside of England. But another problem arises, who really lets world class strikers leave in January? Time will tell.