Yes, in my opinion, losing Klaassen would be by far worse than losing Rashica. As you said, our midfield is already way too weak as it is, and I'm really not looking forward to watching a midfield consisting of Möhwald, Eggestein and Osako every weekend... Stöger on a free would be a decent signing, but still feels like loss of quality. Hopefully Klaassen leaving would at least mean more playing time for the likes of Mbom and Schmid.