Well, watching this episode again I can actually buy Mitchi's new-found strength. He's utterly cracked. He's insane, and nothing phases him. Not even his hallucinations. It's not like he's improved as a fighter, it's more like he now enjoys fighting and doesn't care about the pain. While catching the finishers was ridiculous, it does set up Mitchi has a formidable foe, which is great. The way he moves in this episode is really reminiscent of Ouja from Ryuki.
And Roshuo definitely proved in this episode that his closest real world counterpart was Takatora. (this was confirmed, just never could make the strong connection till now) They definitely think the same.
Finally, the best thing about next episode is I have no idea what is going to happen. I look at the trailer and go "eh" but then I realize something extremely significant could happen that we don't know about and hopefully ep 40 will be a huge surprise.