We are much further in negotiations with Aguero then we ever were with Dzeko.
I don't ever remember the Wolfsburg DS (Hoeness?) having any intention to sell him to us, never heard anything from Dzeko saying he wanted to come here and his agent was always non commital about a transfer to us.
This Aguero saga seems a lot more likely, as we have his agent and the president of Atletico clearly stating we are after him and have a very good chance of landing him. It's clearly up to us and not the other way around,