User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-64.134.226.149-20150720175522/@comment-26564607-20150721134702

He was supposed to be promoted to High-class but according to Sirzechs the Higherups said that there should be a process to follow. So he has to be promoted to Middle-Class first then High-Class some time after.