Personally I like to trian with a sempai, that way I can learn more. I still believe in communication between senior students, and lower rank students. This ensures your learning it correctly. I knoe not always, but I do believe the senior students can learn from the beginner, because they were once a beginner. I had 1 one time opportunity to talk to Yamada Sensei at a seminar he came to. He was the best. He took his time with me, even if it was for just a moment, and showed me where to step. We were doing an iriminage technique. And my partner was a student from Charlotte Aikikai, or New Jersey, cant remember, but he was also very patient, understanding. I think I had been doing Aikido at that time for about a year. I was sort of a newbie, in retrospect. Still am!