I'm going to suggest from the evidence on hand that THRAK and SoM are Robert Fripp mixes with JJ as assistant. (This is also a direct admission in the liner notes in the 5.1 THRAK release.) I still think the man has skills. He's obviously a musician. (You have to be a musician to mix. Weather or not you learn any instruments.) Literally every other mix I've heard with his name on it is unfinished at best.
That ELP BSS rough mix with the bass routed to all channels in KE93. If that was, say, the wrong file set delivered, why didn't it get corrected for reissue? The Chris Squire album is missing mix elements and unfinished. There's a grossly unmixed live set on one of the Tull releases from the Bursting Out tapes. You might guess it was labeled wrong and just an upmix... until you check out the stereo mix of the same. There are balance differences between them that show that these must be mixes from multitrack. Just blown off and less than a scratch mix. How about that Moody Blues upmix? Yes, the tapes don't exist anymore but why was that failure ever even released? The vocal issue on his ELP Trilogy mix. Is the vocal reverb really printed to the vocal track and there was nothing that could be done? That issue isn't there on the original mix, so... nope!
So, those would all be things not to do in a surround mix.
I still honestly hear elements in some of this work that suggest a serious effort was at least started. Proper natural unhyped and not shrill sound elements in place. Dynamic range and some mix elements really on point. But then the errors and unfinished bits that just step on the whole thing. Doesn't make much sense.