"I will never tell a seito that he/she cannot attend another dojo, I give them my advice.
If a seito or yudansha attends a separate dojo, in my opinion he/she is not only burei (disrespecting) their dojo but also their sensei. To me it means that they do not understand aikido gensoku (principles) also it shows that they do not understand giri (obligation) makoto/seijitsu (sincerity) magokoro (true heart). It also shows that he/she have no sonkei suru (respect) for their dojo and more important no sonkei suru (respect) for their sensei.
You cannot serve two masters. Each sensei has a different approach to teaching and applying a technique this can cause confusion, a seito may think when at keiko.... " What is going on my other sensei does not do it that way?" therefore confusion no progress. If a student/yudansha wishes to go to 2 separate dojos I leave it to them, but they have no place at Makotokai dojo. A seito can attend seminars with various high grades i.e. Chiba sensei/Saito sensei etc, that is acceptable. You have a choice. If a seito decides to train at 2 separate dojo then he/she is burei (disrespecting) their own dojo and sensei progress will be slow, you are in the wrong dojo. if you feel that you need to have 2 separate dojos and sensei you are in the wrong dojo. if you have no sonkei suru (respect) for the teaching from your sensei you are in the wrong dojo. if you have no sonkei suru (respect) for your mother dojo you are in the wrong dojo. All I ask for is chugi (loyalty) rei (respect) meiyo (honour) yu (courage) etc from all my seito. If any seito cannot give me and our dojo this then you are in the wrong dojo. As I have said I leave this to each seito if they do not understand then you are in the wrong dojo. Always keiko with junsuina kokoro (pure of heart) soshite sunaona kokoro de (and with an honest mind) sensei o sonkei suru (respect your sensei) If you cannot then you are in the wrong dojo."
KUDEN From Coyle sensei