User blog comment:B214/Question and Answers 6/@comment-24098614-20161123200843/@comment-10330822-20161128175806

Hmm, Rizevim becoming Trihexa. That would have been interesting.

However, I almost feel Trihexa's mindless nature it what makes the fact they were able to do the sealing even make sense. Had he had Rizevim's intelligence, I don't feel it would have worked.

Also, it would seem like they are trapping Trihexa until something powerful enough to kill it appears. Something even stronger than Great Red.