I'm saying that what I found, from training with an internal expert was pretty straight forward. Integrating that into your task specific context will, no doubt take some time.
Like a football running back, understanding the theory of what he needs to do is pretty straight forward, he can learn the exercises, drills and methods of training pretty quickly, he won't be a good running back for years to come. But he also won't believe the process is mysterious or that only a few running backs will ever be able to do it.
All things being equal
Training under an Aikido shihan (who lived in Japan for 11 years) makes that Shihan an aiki expert? And your logic being consistent, then anyone studying under said Shihan got it one to two years....right?
I think it is telling that you continue to equate athletics to internals and external blending to aiki.