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True. Just yesterday, we were commenting on some accounts from my local board having gone from heavy posters to lightweight posters there, whilst being extremely heavy posters on the global boards. Peoples posting habits may change overtime due to their personal interests or available time. Nevertheless, from a local boardss perspective, it would be correct to say that a given account is lightweight, heavyweight or whatnot, though they bear a greater posting category from a global forum perspective.
One could though device an analysis based on this double categorization and see the resulting percentages (time consuming though). I do that in a sense for my local board in relation to earned Merits (earned local vs earned global), though not for post counts.
Side note: In fact, one interesting question which we cannot answer, is how many global posters could post locally, but dont. I dont mean that from a nominal recriminatory angle at all, but simply from a quantitative perspective.