I'm still very skeptical of it and frankly I'm skeptical Josh is only worth a 3rd rounder I suspect teams figure the Cards are testing the waters so they're going to leak out 3rd round just to see what feedback that brings.
Unless the Cards are just convinced Josh is not the guy but outside of Keim, who is still around to make that call? I mean I can't believe anybody on the prior coaching staff still has enough pull with the organization to convince them Josh is not the guy, there's a reason they all got fired so quickly.
I would only do this move if the Cards can get a first rounder for Josh, if that's not possible you're trading a guy you used a 1st, 3rd and 5th on, after one year to go to a very unproven QB in Murray. HIring KK defied convention but drafting a kid #1 overall who went into last year with 8 Td's and & 7 INT's in 2 short stints at A&M before going to OU would REALLY be out on a limb. If you get a 3rd back for Josh you're giving up the chance to take Bosa and Josh, for Murray, he better be good.
If you watch the highlights again the guys are wide open, no pressure on him and he has that hitch in his motion where he pats the ball then it goes back and then zips forward. The end of his release is a thing of beauty, snaps it off quickly but it takes awhile to get to that point so many of the throws in his highlight package have a WR slowing up to wait for the ball again, not lack of arm but slow release. If the Cards and KK think they can coach that out of him then yeah he's intriguing.
I think it would be a massive gamble and again if it's me you need a first rounder for Josh. The perfect scenario is take Bosa, wait for Washington or whoever to be on the board, if Murray is there, take him make the trade, otherwise stand pat. If they take Murray #1 overall frankly I wouldn't even trade Josh I'd let them both go into camp and compete for the job and eventually trade the loser.