Don't understand the choice. Just ask Alexander Isak about how they treated him over there as a young striker. And also, wasn't the point of what he did in the CL this season enough to get him to skip a step like Dortmund and go directly to a top european club? Its a lose lose situation for him, he either keeps performing and will have the same contracts/teams wanting him a few years down or he doesn't live up to the hype of this season.