They have tiers.....
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if only one person is left from tier one. Let's say player C and that's an OT, then by Tt's bpa philosophy, you should take him even if you don't need him. But usually there are a few guys to choose from and that's why they usually get a guy that fits a need. This year is deep at edge, cb and RB. Those happen to be needs. I'm guessing we'll get one of those with each pick in the first 3 rounds.