Question
The whirlpool and eddies analogy sounds good and may often be how it happens, particularly around the gas planets and in the coalesence of planets around a star.
But:
Are you saying that you do not buy into the collision theory of our moon's formation?
We appear to be the only rock planet known to have a moon, or do you not subscribe to D&P being captured asteroids and P&C out of the mix entirely.
How is the surface of Venus like the surface of the moon, other than being rocky and mountainous like all the others?
I am a big fan of symmetry but chaos can have a certain symmetry of it's own and of course there are always exceptions to prove the rule.
Regards,
FLC