[DrChief]

Well, maybe not Ren. This could be Desast's way of trying to get Ren to join his side: becoming a swordsman. Because clearly swordsmen are signs of strength.

This is also probably the reason why the Haouken Xross Saber doesn't appear to have powers based on the Mumeiken Kyomu. Clearly Desast interfered.

Now the real question is if Desast remains a wild card, form a temporary alliance with the swordsman because chaos, ally himself with Storius, or become the surprise final boss? And did he steal the power, or did Bahato give up his powers?

...Probably stole it.