Makes sense for 1933. As for Aikido or spiritual......nah.
That would be difficult, since Tadashi Abe didn't even begin Aikido until 1942.
Ueshiba did think enough of Mochizuki that he wanted to adopt him into the family and make him his successor. In 1951 he taught Aikido in Europe with Ueshiba's blessing. His 10th dan was specifically approved by Kisshomaru Ueshiba in 1979.