Lori Ann Hermano
1.How did O'Sensei record them?
The short answer is, he didn't. It was left to his students to catalogue and categorize them. You see the results of this in all of the various names and terms across different aikido organizations. Some of the techniques were named from the section of the Daito Ryu syllabus that they came from (ikkyo is based on several similar kata from DR's ikkajo series from the hiden mokuroku for example). Keep in mind that even Budo Renshu was not written by OSensei, but it was approved of by him and for a time acted as aikido's mokuroku (transmission scroll), so there is some added weight (imho) wrt what is presented there.