User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-16281343-20140619135234/@comment-24866657-20140619140612

Either Kiba or Issei, Issei has showed his ability to lead his comrades in vol 9, but back there Asia was the one Rias gave the permission for Issei to promote, it lies somewhere among that part. However, remember there's a term that called "Figure Head", Asia might be the president but the one in control actually is Issei, Kiba or Ravel.