I wouldn't.
Why do we offer so much for Dzeko? He is a fantastic player and is in a position we need quality at, but we could leave him alone and strengthen more than just one position. Plus we wouldn't give up Diego (if there is any truth in these rumours).
Our defense still needs work (a lot imo) and a LB should be first on our list.
With offering for Dzeko, we should offer cash + a player in that same position. Looking at the lack of quality we have in that position we would mainly have to use cash, which would almost defeat the purpose.