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Imperial Masterpiece
Some well known suppliers use what I consider poor soil. Particularly, Brussel’s. I always, always, always repot anything sourced from Brussel’s ASAP.
Brussels soil....shudder! Bad stuff.
The tree from Bill may or may not have ever been repotted by Bill (depends on how long he had it) so while he uses good soil, it may or may not have good soil in the pot. Or, depending on who repotted it and how, there could be good soil surrounding crappy Brussels soil in the center. Lots of possibilities. Tree looks pretty healthy and vigorous, though.
Interesting tree, I'm looking forward to seeing that structure when it is thinned/cleaned a bit.