Great thread Zip and it's got me thinking way more than it should (slow day at graft) due to your 1 player rule.
Gonna be controversial but we haven't been creating a lot of chances of late so would Haaland really be hammering them in the back of the onion bag with the lack of chances we've been creating, Alternatively with Wilson not firing and I'm still not convinced with Izak, would De Bryunes pin point through balls be worth anything if no one is on the end of them. I think the answer is in between the two, a quality forward/midfielder that creates as much as he scores ala Messi 4/5 years ago.(bare in mind this is fantasy so I can choose who I want .)

But to be totally honest with you the only obvious choice is Ross Stewart if we could afford him.