There's no rational explanation for who does and doesn't get into the HOF. I mean, before KG and Ray came to town, Vince Carter probably had a much better chance of getting into the Hall than Pierce, even though they're statistically not at all that far apart. But now that Pierce has a ring and has shown himself to be light years better defensively than VC, he's a sure thing and probably makes Vince look even worse in the eyes of HOF voters.
Mike