I have been to at least two seminars where the teachers (both of them direct students of O Senseiīs or students of one of his direct students) claimed that their way of bowing in was "the right way" and "how O Sensei did it". Needless to say that they both did it in different ways
If anyone tries to convince me of doing something "because this is how O Sensei did it" then that just makes me suspicious. However, if they explaining to me why
they do it the way they do it, then that gets my attention and interest.
If there is one thing that I have learned then it is this: If you put 100 aikidoka in a dojo and ask them for the right way of clapping/bowing/putting on the hakama/doing ikkyo/(*insert technique of your choice*) then you will get 100 different answers. It gives me food for thought and is the basis for such a wonderful discussion board as aikiweb, but instead of discussing clapping for hours (which timewise takes up roughly 1% of practice) Iīd much rather go and train...
And regarding shintoism/Omotokyo: I canīt remember where I read it, but didnīt O Sensei used to get upset if he caught people "imitating" him in the way he prayed, etc? Does anyone remember who wrote that?