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

My biggest concern is injury. If MM isnt ready I hope Young can step in and take one of those spots which probably leaves David/Gay starting in the other spot with whoever loses that at nickel. Jason Craft has been on this team for years and has never shown he is capable of being a starter. I would rather have a talented rookie playing and learning in that dime or possibly nickel position. Morgan probably wont make it through the season and even if he does we don't know how good he will be coming off the injury so a rookie would have a chance to start there and any of the top 4 DTs would probably see signifigant playing time in the rotation at tackle. I would love to see a safety come in and start over Bullocks but I dont see Payton taking him out.