That sounds likely enough, and blake_reitz said the same thing, so I'd say it's pretty reliable. This is what I get for never actually having read Warrior (despite owning it), isn't it? Volksjager mentioned Arisia (who I had totally forgotten), so that's another clue I missed.
Now that I think of it, I don't remember Kyle being all that big when the readers saw him the first time on the beach, but he did seem to fill out the second he got the ring (though I could be imaging things at this point.