As i interpret the HW rules, a trait like 'large' or 'size' doesn't actually/primarily say how large the creature is. The value after the trait represents how good the creature is at using its size to its own advantage.
A human with 'big' 2ww is bigger than an ordinary human but still nowhere near as large as a rhino. The trait rating merely means that he's very good at putting his size to good and effective use.
-- - Mikael Raaterova [.sig omitted on legal advice]
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