Cool, yeah I should probably have preceded my post with in no way trying to contradict you just trying to add to the post, and ask a few q's as with these types of things experience is king, and I lack the experience.
The blue spalt not softening the wood makes sense, iirc the hyphae will tend to feed on free carbohydrates in the cells rather than breaking down the lignin so they aren't decomposing the wood in the same way.

Have you experimented with spalting your own woods?