User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4911512-20120626022532/@comment-4555457-20120727150253

iirc the Jhen Sub is slightly smaller than regular jhen though it does have larger tusks, it could possibly be that jhen goes through a period of aging where its body is condensed and hardened to the crystals of the sub, and its tusks would grow like crystals do (crystals grow, google it if you don't believe me)