In the interview posted at http://www.aikidofaq.com/interviews.html
O'Sensei said that he studied many martial arts in search of true Budo.
It was after training with Takeda that his eyes were open to true Budo.
After training with Takeda when his eyes were opened to true Budo did O'Sensei stop training or learning other martial arts? Was Takeda the last martial art teacher he had?