I'm focusing more on the player's fit into the team....it's not like hoping your draftee is a round peg for a round hole - considering the turnover rate of players at all positions, the hole can be round, square, star-shaped, etc., and is constantly changing. The coordinators change every few years, too, so you're basically drafting a guy in the hopes that he will be able to excel in any situation, which is unlikely for any player, no matter how good.
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With all the moving parts, no one is LIKELY to succeed. But if you luck out and hit on enough guys being solid contributors and lady luck helps with the breakout players at least at the rate of chance, you might avoid "bad" drafts.