All of the information for the video is sourced from this thread. Like a few posts above those pics are from links within this thread.
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I still think callus is part of wall 4 and it's and other reactive chemicals across the span of the wound developed by heartwood and possibly traumatized cells dieing on the face of the wound are the wall.
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I believe wall4, whatever it's chemical properties are,
is grown after the event. Take a look at all the diagrams, pictures and micoscopy. You dont see it within the current years rings but as part of the next years or growth.
Also, if it was existing cells within the current years growth that changed to some chemical barrier yet tangible and see-able with naked eye it would be present on the face of wounds where no callus formed. But it never is. It is always accompanied by wood on the outer side of it.
When you get a wound you can have localised growth. Like a pruning cut starts to form a doughnut. And you can get your normal growth rings to. Sometimes the two work together. However, again look for yourself, do you think it possible for that thin wall4 to generate normal ring growth afterwards? NO? So where does the wood come from then?
I say it was already there and when it is there it morphs to wall4 laid against the wound.
Now regarding heartwood compartmentalizing and having stored stuff, sure, but it is not alive, it doesn't generate new cell growth, it's a sink. However Rays which are connected between living cambium cells and dead heartwood can transport deep into heartwood, that's what helps stop radial spread.
What I'm trying to focus on here is wall4 which occurs on the outside of wounds, the growing side of wounds.