a. It was already established one of the root causes was our lack of understanding the physics. And he pointed out we can't yet solve the 3-body problem.
No it wasn't established. The only issue is a mathematical one. We understand the physics of the 3-body problem perfectly.
But the issue at hand is whether we can have an accurate simulation of a physical system, not if we can understand it perfectly.
At any given point we know the gravitational forces between any of the bodies.
And we don't know how to integrate them.
You simply don't understand this.
Now you are being rude and I stopped reading.
Please, somebody close this thread: It had little promise to begin with and I can't imagine anything good coming from it at this point.