If anything, honestly, I think Dzeko could't shine to his potential because Roma has limited players. I'm pretty sure he would have scored a whole lot more here (during his stay in Rome, not just last season). But yeah, I don't expect him to score as much, especially with Ronaldo upfront, but I do expect him to help a bunch, creating space for other(s) next to him, winning air duels and simply keeping the ball front, waiting for a build up.
We'll see how it goes. I might be wrong. But I think he's going to be one of our best buys and quality added is gonna be instant, plus the synergy with Ronaldo and Dybala is gonna be simply perfect imo. I have two things that worry me only:
1) I don't like the fact that both Ronaldo and Dzeko are quite old and we'll need to replace both at the same time sadly. Such players require heavy replacements, meaning heavy cashing. In order to replace the two we'll literally have to chase Mbappe. Others won't fill the gap surely.
2) I have literally ZERO concern with our froward line if we grab Dzeko. However, I'm scared shitless about our mid department. It's gonna be scary and a HUUUUGE gamble if we have settled with what we currently have. I have a huge question mark over Arthur plus Rabiot is 50-50. THAT is what worries me.