Board Thread:Archive/@comment-26993737-20180203014136/@comment-27729796-20180203025217

It's also mentioned in-game when entering his lab that it "looks like it belongs to the Ultimate Prisoner instead of the Ultimate Tennis Pro". It's more or less a "modified" talent he chose for himself like with Teruteru or Himiko I think, he mentions that he doesn't consider himself Ultimate Tennis Pro a couple of times and seems to identify more strongly with being a prisoner.