It is important to ask the teacher who their sensei is, nobody can progress in a vaccum.
In other threads there was a queston on why to grade or continue to grade. For me, I have seen different doorways open after gradings for many people regradless of how high the rank. My Sensei is 6th Dan. Recently he said that looking at Takeno Sensei he knows what his Aikido should be when he's 50 and at looking at Kancho Inoue Sensei what his Aikido should be in his 60's, and being Uchi Deshi to Shioda for ten yrs certainly means a vast heritage for all his students in Aikido and even other aspects of his life.