I meant Daito-ryu being faster as in you don't need to learn all the philosophical stuff, but maybe Takeda-sensei do have some of the spiritual training included, not sure...
I certain know that the things O-sensei said isn't just philosphical. He derived it from both his spiritual and martial wisdoms, and he left them behind with the express intention that we learn both from it.
I think he too realized how little his students learned from him, and he might've left those writtings behind for his students, so that when they are ready to learn, they will have something to look at.
I've rarely been taught "philosphical stuff" in an aikido class. Progress is slow enough as it is...