Quite simple really. See it all the time. People reverting to what they used to do or even thinking, as many still do now, that he must be doing those secret internal daito ryu stuff.
Still in the old time samurai mindset.
And, I wonder why he promoted Gozo Shioda to 9th Dan for not doing "his" aikido. Similarly, Rinjiro Shirata, Minoru Mochizuki and other pre-war students were not doing "his" aikido....that's a bit too far fetch AFAIK.