Let's not forget that out 3rd round pick is a very early 3rd round pick. (Another way to view it is that it is an extremely late 2nd round pick).
Rather than try to scope out who we'd pick (kind of like hitting a moving dartboard blindfolded) I think the way the Cards should play it is like "the Catcher in the Rye."
Sit at the bottom of the cliff at #70 and see what drops over.
We might be surprised.
Regarding wide receiver - remember that we have a narrow job description because we already have a lot of fast guys with hands. The guy we want should ideally be 6-2+, 200+ lbs, run 4.45 or better, have most receiving skills and the ability to refine the skills he lacks.
Calico fits the profile. Bethel Johnson and Curtis are blazers but a bit short. Gage and Aiken are too slow. (If you like Gage, re-sign Tywan Mitchell). I don't think Tallman Gardner will drop down that far, but he's worth considering too.
But what do we do, for example, if we draft Leftwich, get Dewayne White with our 2nd round pick and a good CB like Weathersby or Sammy (No Relation) Davis are available along with Calico? Then it becomes of value judgement of who's best on the Cards' board.