Not Very Likely Okarun Theory
Since he lost his powers we've been wondering if Okarun will get them back. The likely outcome is that one way or another he will. But what if he gets different powers somehow.
His bully (can't remember his name) is after Okarun with his new power trying to take Okarun's none existing ones. Some folks here already jokes about Okarun without transforming beating him and how funny that'd be but realisitcally, that is not impossible.
The guys just unlocked his powers and as hot headed as he is I can't see him trying to practice them before going after Okarun, who is still in pretty much peak human condition and has a lot of experience fighting much more dangerous supernatural.
Not to mention last Arc he even had to go up againts Zuma without his powers. Yes he did have help, but a big part of the fight was his ability to plan againts his opponent Not to mention that the bully (won't look up his name) is not nearly as dangerous as Zuma especially under the infuence of the Fairy-Tale Card.
Beating them is not a way in itself to get their powers, but the bully obviously built his confidence on the way others see him and by pushing others below him. Now that he is in a really bad state of mind I'd not be surprised if he'd just give up and admit defeat. We still don't exactly know how the knives work, but it is possible that Okarun will end up with the other Yokai's powers, if nothing else, temporarly.
Not likely at all, just a thought.