I think both should stay unless the Falcons draft a Cb in the 2nd or 3rd round.
Given the ages of our top 3 corners, coupled with the fact that Samuels is not the most durable player, and who knows how the Grimes situation plays out, you want to be 5-deep at corner. Owens has proven himself to be solid on the outside. Imagine the scenario where one of the "Big 3" gets hurt, specifically which ever one is the nickel/slot corner. Then Franks steps in the slot role, but he blows. At least with Owens you have another option to turn to. You don't want to turn to that option, but it's at least a known commodity.
"Vincere scis, Hannibal, victoria uti nescis" -- Maharbal, 216 B.C.E.