From what I can extrapolate, Osensei had 'followers'( uchi-desi) that lived/trained with him thru-out his life, but at different times of his life, so they learned what he was doing at the time ( altho he went on to evolve Aikido, (as he got beat in competition)they believed what they learned was the "true Way" , so they stuck with that and taught their own students, who in turn went on to have their own dojos and taught the same to their own students, etc all in respect to their Sensei. Now that's not to say each transfer included some personal 'tweaking' that changed it slightly, but it was still close enough to the original.