Isn't it bizaar how much rubble stuff there is and how deep and vertical the roots are?
When they air spaded these there was not real or decent buttresses.
And the deeper roots seemed healthier from you observations than the surface ones. Could be white rot or dry rot etc, maybe deeper they weren't as drought affected.
Now take a look at this close up of that root ball, look at the rocks and rubble mate.

Now remember that's about 3' between the red lines.
I was thinking today. Now comes the cycle of death.
You see, the pruning is taking huge amounts off, in turn roots will suffer. The epicormics have already started which introduce more pruning and hazard management.
Now in the last 2 months I have been there some of the pruned trees already have significant dead wood. So the root dying is confirmed along with epicormics. And that's in the wettest 2 months we've had.
Check this out. And this is how the others slowly went then they toppled, I know these trees well.
