Rosen got sacked 45 times last year, 7th in the league:Arizona probably has the worst OL, TE, and WR corps in the league.
Far and away the best scenario is to trade down 2-5 spots, keep Rosen, and get more picks. Murray might be a good QB but not with zero talent around him.
NFL Football Player Stats & Stats Leaders - Sacked
So Murray is def gonna be taking some hits. Also, I guess some are comparing him to Russ, stature-wise. But RW is still an inch taller and 20+ lbs. heavier.