Raw is overloaded IMO, right now. And Hirohito could be used on Smackdown as the new leader of Kyo Dai (Akio and Sakoda).
He could cut a promo about how under Tajiri, they were going nowhere, but under Hirohito "a true leader of men", Kyo Dai will come to be feared and respected. Follow up with a decisive victory over say Rikishi and Scotty or any other face team. In the following weeks, have Kyo Dai gain clean victories in singles matches, but then after the match is over, have them do a 2 on 1 attacks with Hirohito just watching (leader never sullies his hands unless he is in a match).
Have a credible midcard face confront Hirohito about the attacks backstage and get beaten down by Sakoda and Akio. Then later that night, have the face (who would be selling the VICIOUS beatdown from earlier in the night) job to Hirohito. The following week, have Hirohito cut a promo about how the other wrestlers don't respect Hirohito and Kyo Dai and how he will prove all the naysayers wrong when pyro starts goig off and Masks are being shown on the titantron. Ultimo Dragon (this isn't mark fantasy

) will come out and challenge Kyo Dai to a 6 man match for honour on the next smackdown.
Next week, Ultimo and his partners (I guess, Rey Jr. and Moore

)
job (I can't believe I want Ultimo to job

) to Kyo Dai, due to one of the other guys getting pinned after not tagging Ultimo in. Ultimo SNAPS and starts kicking the hell out of his very tired partners, then Kyo Dai joins in and it's a 4 on 1 beat down. Next Smackdown, Kyo Dai comes out and introduces Ultimo Dragon as the newest member. Ultimo comes out in a black and gold mask (I know he has one like that) and a black suit (like Akio and Sakoda's ones).