That would be a valid concern if he didn't come back and play the last two months of the season. If anything, with the COVID related delays, that would alleviate any concerns about whether he could have come back from it. The season would have ended by early June, and no one would have been able to get a handle on how he would have recovered. Instead he got 2 months of game time that he would not have normally received.
I think that Dzeko is a better fit, but no one can convince me that he is a better player
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Dzeko better fit, but I think Suarez is the better player