Was just going to say, "in a perfect draft and develop world" that is what you hope for, but swhtset chimed in already.
If you look at what the Packers have been attempting at CB, you see where a few failed picks and/or career ending injuries (Shields) set you back. Same could be said at a few other positions. WR seems to be a nice hit with Adams, but since then nothing and now we are looking at what happens when all those pics and UDFA's don't pan out.
While it's nice to hit on both edge and CB in the draft, since having to do so in Free Agency is very expensive, the Packers are running out of time to start hitting in the draft on either position and that need is already past gone at CB and very close at Edge.