Keep in mind also that a portion of the XP (often the quest-based ones) awarded over the course of SOA/TOB is a fixed amount to each member of the party rather than an amount that gets divided between party members (as for XP from killing monsters, scribing scrolls, etc). I don't know the actual percentage but this would be a mechanism for getting even the 5-6 member parties to a relatively high level.
I don't think you can easily extrapolate the amount of XP that can be obtained by a party of a certain number. The bottom line is that with an XP cap remover most parties that work through both SOA and TOB can become pretty darn powerful.
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\"Though we name the things we know, we do not necessarily know the things we name.\" -Homer W. Smith
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