Buffalo plays a Cover 2 defense where their CB's play 95% of the time in zone coverage with very little man to man responsibilities. Few if any Cover 2 CB's are very good in man to man coverage so there is no guarantee that Greer can be a solid shutdown CB.
The top priority positions on a 3-4 football team's defense is DE's, NT, OLB's and CB's in no particular order. Dallas and San Diego who play in a 3-4 defense have used very high picks on CB's so saying don't waste a #1 or even a high pick on a CB is ludicrous. When we draft, if a CB is the top talent left where we pick, we should definitely grab him without a second thought.
Saying Savage agreed with you this year is rather silly since we drafted very late and only had a few picks. He may very easily target a CB next year when he has some high picks to use.
I do agree that at this time we could use another veteran CB badly but finding a decent one this late is almost impossible.