I think I would rather go for Gyokeres as central striker at this point. I've seen enough over the last 18 months to feel like he's not just beating up a bad league - he has really good ball striking, is physical and quick, has a nose for the goal and an attitude you want as a goal scorer. He's also always available, which Isak isn't. I love Isak too but the injuries concern me. If we aren't going to go for Gyokeres, I still love Sesko's potential.
I think we need a striker and a world class left winger in the next two windows to really take the leap to the elites globally. Another midfielder would be nice too but adding someone like Kvara plus Gyokeres would be such a game changer for this team.