I do agree that sustained eccentric loading is a possible source for the diagonal slice. Thanks to the public record of the board, you can see that I've mentioned eccentric loading several times as one possible end run around the 'harmless elastic waves'. This came from observing a small expulsion from the NE corner very low down ahead of the collapse front. The best guess was sustained eccentric loading and reaction force from the roll and offset of the upper block.
I think I even mentioned it in this thread!
To me, it was only a reasonable possibility until I saw this GIF, which portrayed sufficient deflection scaling to allow a gross visual quantification. Now it seems like the likely explanation for the little corner puff (stress concentration) and may explain the diagonal slice, which are time and space correlated.
Just my opinion, can't prove it and don't care to try. Look at it! J. H. C*****!!!!
Only a possibility, but if it is assumed, it throws out the notion of no failure occurring below the crush front (other than the damn jets which are supposed to be superficial), which is distinct from all energy dissipated at the crushing front, which is distinct from the harmless waves argument - all of which I've been saying for a long time. This stuff is important!
By focusing on an idealized published model as a target, ancillary assumptions and 'predictions' also become targets. Bazant says 'only harmless elastic waves' and blows off Cherapanov (which was probably the right thing to do) and there's nothing left to explain what diminishes the integrity ahead of the crush front, except explosives.