Not sure why they need Jovic , when they alread have 2 top 10 strikers in their squad.
City perspective: Well Aguero is 30 and maybe Pep is not all in on Jesus. Plus having a boatload of players good in a position doesn't stop City from trying to get more, keep them away from potential rivals is an added bonus.
From Frankfurt's perspective I would think they are just going to try to get the highest bid, even better if it ain't Bayern.
From Jovic camp, get the best wages possible, I will be good enough to beat out any #9 in my way anyway.
Now from Barca perspective, if we really think he is the best guy out there as a long term buy AND can help out Suarez starting fall 2019, you want to try to close this deal sooner than later.