>>150035402 (OP)
Do you think whoever wrote that Ghostfreak episode where he was the villain got in trouble for it?
"The show is Ben 10, and you decided to make one of them unusable, and a villain that can take over Ben."
They even replaced him with Cannonbolt in season 2.
If the show was more competent, this could have been a cool idea. Maybe the Omnitrix could sometimes randomly give him Ghostfreak, and now one problem turns into two.
Now that I think about it, Alien Force also had nine aliens, and one that they never used.