Re: exiting a dojo
What matters is the practice. Just move on and never look back. You will practice with many senseis in your aikido career. Seeking your "true" sensei is part of the aikido journey. It is a difficlut task. Sometimes you get lucky. Sometimes it is accidental but oftentimes, you really need to search. There si also the chance you won't find him. This is the key take away from your experience; he is not the sensei that will help fulfill your goals, another one will. So there's no point in dicussing anything with him.
IMHO, promotions are not really important. What you need to assess is if you've trained hard enough, observed intensely, studied intently to be competent with the art and understand its principles, to continuously learn new things. It is a never ending cycle. The goal is not to get promotions, the goal is attain perfection, wisdom and enlightenment. Attaining rank will follow.
I'd gladly trade my black belt and hakama with a white belt. These ornaments are not important to me.