Board Thread:New on Ben 10 Wiki/@comment-82.46.142.194-20130521181710/@comment-11462520-20130701214618

Maybe humongousaur's growing power is one of those things that omniverse just got rid off, like lodestar not opening his mouth when talking (now in omniverse he actually does it), or the planet primus, etc.

Or maybe it hasn't got time enough to be used. I mean, humongosaur at his regular size is able to handle most of situations. Maybe his full size will come out at some point, when battling against a too powerful or too big enemy.