The problem being, of course, that people don't agree on what aikido is - so "aikido to simply be aikido" doesn't really have any meaning without that common agreement.
You're right, of course, but I think you can see what I'm getting at. Aikido isn't a religion. It isn't a method of acquiring supernatural power. It isn't a shortcut to nirvana or union with God. If we do not expect these things out of aikido, then there is no need to believe that aikido's founder was anything more than a man.