Greg Jones,Jerome Bettis, or any other guys built like Stephen Davis are feature backs, or half backs...tail backs, running backs because they have running skills and speed. Fullbacks are small Guards or TE's really. All they really do is block and hit people for the most part. The one fullback that is a decent running back is Mike Alstott, but he doesn't make an ideal feature back either. Just because you have size doesn't make you a fullback. Wells is a very large back but he hits like tinkerbell.
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