They aren't pre calculating
The game connects to a cluster of servers and they do heavy operations there and send info back and forth in between the X1.
It's like having a massive CPU with a small high latency link in between it
You really are banging hard on this drum. No game has ever done this. I welcome it. But until we have a working model you really have to give it a rest.
I believe that you have full confidence in Microsoft. That much is true. But with no working model it might as well be talk. Unless they have a working model at E3 - what's the point?
When can we see the first games using this. How many devs are working on games using this. Zero? So we might see a game with this in 3 years? All to help with some grass animations - cool.