No way I'd take Flowers over Hyatt. Flowers will have to play in the slot, Hyatt can play anywhere.
Hyatt is bigger, faster, has better hands, and was far more productive playing against significantly better competition. He was the best homerun hitter in college football and it wasn't close. 4.4 doesn't really do justice, he plays faster than everyone else on the field.
Quinton Johnson is a different player. He can be your Calvin Johnson/Larry Fitzgerald go to workhorse. He'd have to be the pick if you wanted a WR, but he won't be there.