Your first two photos of the tree did not inspire me. The knobs and the abrupt angle changes at the trunk chops, just not a coherent image to my mind. I just said to myself this is not going to ever turn into much.
The tree upon arrival was a little wanting. It was my intention to airlayer the interesting part off the top before all the weird growth/death happened.
BUT, ta da, with the rotten wood removed, that trunk has a whole new character. There is interest there now. Hopefully you can get it to recover, pick up vigor, and start really growing again. If you can put it into a large grow pot, or the ground, and let some escape branches extend out for a couple seasons I think the transformation will be dramatic.
It seems to have recovered very well this season. I don't recall (maybe if I re-read the thread...) If I repotted it this spring or not, but its in Boon Mix and I didn't cut anything on it during the growing season. There was also good growth around all of the scars this year as well.
But I would guess you may have been doing bonsai longer than I, so I will ask a question. ... I looked at your location. South Carolina, zone 8, why would you ever put the tree in a greenhouse?
But I don't know your situation. I could be completely off base. But it did strike me as odd, to put this tree in a greenhouse.
I should probably re-read this thread to be reminded of the particulars, but I believe I initially separated the tree into the greenhouse when I initially noticed the weirdness, but probably moved it into the greenhouse during winter because of the obvious stress it had sustained as evidenced by the blackness and branch loss. This year it seemed to have strong growth and had a strong autumn season. I anticipate it will winter under my bench this year. Also, the greenhouse in years past was largely unheated for a good portion of the winter ...only knocking the edge back when the temps dipped below 20 or so (depending on how late into winter it was).
As it is, its to interesting to toss so I'm going to see what can be made of it. The long straight section of what's left of the trunk still bothers me, but I don't think it'll be feasible to change that anytime soon.