To avoid confusion: the term "Aikido" refers to Ueshiba's art, as well as to a group of arts/styles. I study/teach a cousin to Ueshiba's Aikido, also primarily derived from Daito-ryu Aikijujutsu, during the same tiem period Ueshiba was developing Aikido. There are at least two extant arts other than Ueshiba's within the "Aikido" group, and several sub-styles within Ueshiba's art.