Make it up? Hardly
Ueshiba studied 23 years under his one and only long term teacher, Takeda Sokaku of Daito ryu (that's the guy who really was the genius who made all this stuff up)
"It is believed that Sōkaku received his first martial arts training from his father who had a dojo on their property. Sokaku's father Sōkichi was apparently expert in the use of both sword and spear, and had once been a sumo wrestler of ozeki rank. It is believed that Sōkaku was exposed to the teachings of Hozoin-ryu Takada-ha and Ono-ha Itto-ryu, schools of spear and swordsmanship respectively.
Sōkaku then left to go on a period of austere training where he travelled, fought and trained at the schools of many teachers, a not uncommon practise of the time. Reputedly, Sōkaku spent some time as a live-in student of Kenkichi Sakakibara, headmaster of the Jikishinkage Ryu and considered to be one of the most famous and skilled swordsmen of the era".....
Then he "made it all up"