Calls for an "immediate impact" at CB through the draft. Do they make sense?

We filled those holes with Vilma, McCray, Morgan, and Gay
I think Vilma will solidify the mike position but Morgan is probably not going to make it through the season, McCray is going to be a backup at end and Gay was a nickel back at not one of the best in the league. I know he has started some games but he has not shown he is a shutdown corner by any means. This is turning into Simmons, David, Kaesviharn draft offense all over again. Just because we bring in a body in a position does not mean problem solved. I hope every one of these guys ends up being a pro bowler but safe money says they wont. We need to draft D, we have loaded up on young offensive lineman, 2 running backs, 2 recievers, and a backup qb in the draft and ufas over the past couple of years. We have gotten 1 LB, 1 corner, 1 safety and maybe a DT or an end I cant remember still on the team from the last 2 years draft. Offense has done fine the defense needs help