I agree with hustini on this and will help his cause with more arguments that he might not consider important, but i do:
1- Dzeko's age
2- availability of quality finishers of Dzeko's level, contrasting with amount of playmakers, wingers and SSs, both in our squad and transfer market.
3- 4-4-2 that is in our dna, is back and will stay for good, for various reasons.
To expand/explain those arguments:
1- just look at the average age of our forward line and see how many starters we will need starting for the next season!
2- CFs have always been the most expensive, rare, hard to find and hard to get. We wont get a chance to sign such a gifted player every year and if we compromise with a Pazzini type of player, this will compromise our team's scoring effectiveness for at least 5years to come. And such mistake cannot be undone with a change on the formation, like it is the case with amfs and ss's.
We cannot add one more amf, either be a winger, ss or cm to boost the total of our creativity or buy a Cassano type of SS next year, that will immediately blend in and replace the creativity of Diego as SS,
probably even more effectively than Diego himself, or a Krasic type of winger that may be a better winger than Diego due to pace and other reasons that are required from a 4-4-2 winger.
If we cant be perfect within a year, think ahead.
3-we are investing on 2 pairs of wingers, we will keep on with that Italian coaches persisting pleague that has alwayn been our characteristic and will be shared with the Nt as well! Midfielders and supporter strikers will come and go, but we will only buy a top class finisher just once and we already have a load of back up players. Unlike all these variables, consistent scoring can only be acquired by one way, the finisher's ability!
I know you guys crave for Brazilian flicks and we havent had such player like diego, since zz. But unfortunately the Italian sub-coaches we have been using and will be using will not be able to take the max of Diego in the flat 4-4-2, he will other wont be able to cope 100% with his role (of playing deep or wing due to lack of pace and def abilities, or wont be able to use his long vertical passes if he is playing upfront (as SS)
Whilst a prolific and complete finisher like Dzeko will be able to fit in in every tactical choice and offer better results than our current crappy forwards, while being led by the crappy coaches we are getting.
Amauri+iaq are both very useful at creating chances and keep a couple of CBs on them, far more effective on that than scoring, so they can be more helpful besides a Dzeko, than a diego, dp, giovinco, or themselves.
Whilst besides the retiring and unreliable front of finishes, we have no real options.