I’m not sure coaching is the issue with Isak. Mostly, he is just out form for both club and country. When you are out of form, it is doubly important to just work your socks off. Win the ball high up the field. Create space for others with smart ones. At the very least, make yourself a nuisance. That is what Darwin did in spades, which is a main reason he was given so much time by the managers and supporters.
So, I want to at least see Isak work bloody hard, before I point any finger at a coach. The work hard standard should be given, which was a large reason Salah has been criticized during his slump.