This is my knowledge as it istands........Takeda taught Choi and Ueshiba. The two were classmates. They are quite similiar to the naked eye.
I have had the privilege of having two seperate training days with two different aikido black belts.
I showed them the 25 wrist and 25 clothes techniques that are taught in moo sul kwan hapkido. Both aikidoists knew, and did the techniques. However, there were little nuances that made them different.
I also noted that the aikido application was less brutal if you will. Not less effective, less brutal.