Yea that's something I've been struggling with. It's kind of a loaded scenario and I would need to see what the return is for Hoerner.
e.g. Does including Hoerner in a deal with the Mariners get us Gilbert/Kirby when they were otherwise off the table? If so, is Gilbert/Kirby + Shaw + decent IF bench acquisition that can play 2b if Shaw struggles better than the alternative of keeping Hoerner + trading for a lower tier SP?
I could probably get there with trading Hoerner in a few scenarios, but they would have to really knock it out of the park.