Something that's been bugging me.

[RyougaZell]

I believe you can't take a Genin team immediately after "graduating" one.

I mean... Ebisu didn't had a team before. And Kakashi always failed his.

[Genma]

It's a manga; some things aren't supposed to make sense.

[Xscatic]

If you remember in Kakashi Gaiden, the 4th Hokage was still in charge of his group.
So it may be custom for teams to stay and work together. Besides, it may take a special type of promotion or an reasonable amount of experience among jounins before they are given any genin to teach.

[RyougaZell]

If you remember in Kakashi Gaiden, the 4th Hokage was still in charge of his group.
So it may be custom for teams to stay and work together. Besides, it may take a special type of promotion or an reasonable amount of experience among jounins before they are given any genin to teach.

The "Yondaime" (or by the assumed name Kazama Arashi) wasn't a Hokage yet during the Gaiden.
Althought Kakashi WAS a Jounin already.

Kind off Neji with Guy's team.

[RasenDori]

konoha is really big on protecting those close to you. so maybe its a way to get ninja to become close to one another by being partners for years and sharing a relationship.