Board Thread:Ben 10 Discussion/@comment-31574541-20170324174311/@comment-5101200-20170328173152

Infinite forms were never a concept in the show. He can do it, but he never did, so it's irrelevant.

It's not a situation like AmpFibian's mind reading, Wildmutt's quills, or Ultimate Cannonbolt's projectile spikes. Those are all confirmed abilities, so they could be used in a situation like this.

If the creators confirmed the possibility of Infinite forms and explained them, it could be used, but that never happened, so it's irrelevant.