Thank you for explaining with reference to the other principles you were alluding to. Taking the example of the circle, how then do Tissier & Moriteru Ueshiba apply this principle differently?
This is a short video entitled fujita sensei aihanmi 1.
Once again I would say they probably both apply the principle so it's not a matter of differently it' a matter of seeing when they are.
In the video above Fujita starts by showing the ways he doesn't do it and then to how he does or maybe in his opinion how it should be. To the untrained eye it may seem like his technique or rather the hand part of his technique is in, up and down. The whole motion looks like taking up and taking down.
Now, when I say principle of the circle this includes all parts of a circle in action and thus curves and arcs. At the top of his up is an arc. Thus using the principle of the circle.
You can demonstrate this for yourself if you get someone pushing their hand agaist your hand for example. Two forces pushing against each other. You create a small arc and both your energy and theirs will follow it thus you can return the force to them. Just one example of one use of the circle.
Some may do the same exercise as fujita in that demo but emphasize or put more emphasis on a different principle and so it would look the same yet different or similar but not the same.