But the dojos belonging to the Iwama Ryu-network was not affiliated to Aikikai.
I am sure that there are others more qualified to get into a discussion about this however my understanding was more in line with how it is described below:
"Despite this, Iwama Ryu was never officially declared an organisation independent of the Aikikai
, and it can be regarded as a rather informal network held together by the fact that Saito sensei gave out his own dan ranks - Iwama Ryu ranks - as well as dan ranks from the Aikikai Hombu
. Specific weapons ranks and weapon transmission scrolls were also given within the Iwama Ryu" (Wikipedia)
Maybe there were some dojo's that broke away from the Aikikai to later to rejoin, although I have never heard of it, at least not in my neck of the woods.