Draft-eligible players can be overlooked despite their talent for a host of reasons.
Sometimes there's a backlog of great players at a position, and there isn't enough time in the pre-draft hype space to talk about everybody enough. Sometimes small-school players get dinged because the thought is their strength of competition hid potential liabilities.
Sometimes a player isn't dynamic enough in an obvious sense to merit the attention he deserves. That could be a drive-sustaining running back or a run-stopping defensive tackle without epic pass-rush potential, among others.
Though the NFL has become a hybrid league, where versatility is prized as never before, sometimes it's tough to see a player for what he can be because he's lining up at multiple positions and the professional transitions aren't obvious.