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Ahman Green career statistics

In case you didn't know it yet, Ahman Green is the real deal. Last year, he finished among the top 5 RBs for the second time. And he was only 24. Of all RBs whose careers started in 1970 or later, here are the ones who were able to put together two (or more) top 5 seasons before age 25.

Name                VBD after age 24
------------------------------------
Emmitt Smith              780
Barry Sanders             669
Walter Payton             796

Thurman Thomas            577
Marcus Allen              429
Edgerrin James              ?
Ahman Green                 ?
Eric Dickerson            515
Curtis Martin             356
Earl Campbell             289
Tony Dorsett              521
Ottis Anderson            300

Smith, Sanders, and Payton each had three top 5 seasons before age 25, so they're in a slightly higher class than Green. But the others (minus James) averaged 427 VBD points during the remainder of their careers (and Curtis Martin will likely add to that). Among the seven of them, they went on to have 10 more top 5 seasons and 27 more top 10 seasons. So we have, roughly,

Over/Unders for the remainder of Ahman Green's career:

Total VBD:  430
Number of top 5 seasons:  1.5
Number of top 10 seasons:  4

Which side of those bets would you take? I'd probably take the unders, but I think they're all reasonable.