Board Thread:Questions and Answers/@comment-38413232-20190311233813/@comment-28802873-20190418100353

Vilgax already knew how to get inside the Omnitrix, Ben just went Grey Matter to spite him because Vilgax told him his "feeble mind couldn't comprehend" how it works.

Also, Kevin getting the blueprints from a dream isn't that impossible even in a serious setting. Remember that, in "Dreamtime" and "Innervasion", Ben himself received weird messages in his dreams, through signals sent by either Zombozo's machine, or the High Override's mind control. Kevin could've had that as well, though it must be someone else this time.