I don't know about the top 50, but Wikipedia lists the following as the best example of NFL draft busts:
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He was the top paid player in the NFL in 1981 at $600,000.
50
Baltimore Ravens. 7 players.
augusta savage
In ancient Rome, the imagines were wax busts of ancestors. They were stored in the 'alae' of the atrium within the Roman house. Cords ran between the busts, revealing relationships.