Re: dan book?
There are many different approaches to Aikido - even if a dojo is affiliated to Aikikai hombu dojo.
Lorien; Personally I find it a good thing to discover differences in technique and even philosophy. I like seeing variations and exceptions. Even prefer the spontaneous out of the ordinary technique that is not really a technique at all but a once in a decade incident.
Just out of interest; where would you say that the difference in philosophy between your original dojo and your Aikikai dojo lies ?