Well if Nachtvogel knew to how punctuate his writing a bit better, he might be more successful in the field of persuasion.

Secondly, sannin isn't even a class. This goes back to a discussion a few months ago. The official ranks are GENIN->CHUNIN->JOUNIN->KAGE. Sannin just refers to the three legendary ninjas that by chance all came from the same teacher in Konoha. Itachi is pretty strong, but he's not a sannin. The other guys at Atatsuki are probably also real tough guys, but they're not sannins either. There are only 3 sannins and there won't be successors. You can't just promote someone to sannin.

Lastly, the ranking system just applies to the ninja population as a general trend. 99% of the time jounins are stronger than genins, but there are always exceptions. A genin can train really hard and become super-strong, but never take the exams to advance classes. Chunins are basically the same as genins, but just with a different mentality. Genins are usually kids, and chunins are usually late-teens to adults. What I'm saying is: chunins are more mentally mature than genins.