I would be shocked if they took anyone else but Murray. Just way too many tea leaves lining up that way - I mean they literally left Rosen out of a promotional video for the new season, not to mention spending quite a few days with Murray's agent, who also happens to be Kingsburry's agent
I doubt the Cards are smart and cunning enough to run such an intricate ruse ... much more likely explanation here is that they are showing their hand from a mile away thru their usual ineptitude.
All in all, your 9ers will have to decide between Q. Williams and Bosa. I find it difficult to believe that a team would offer them anywhere near enough to make them trade down. Usually such trades involve going for a QB and don't think there are any QBs this year that would be that highly coveted ... And even if the Redskins do get stupid, I'd say the Jets would be their preferred trading partner (to get in front of Oakland), not the 9ers.