In the dusty corners of my head, I thought the sequence of bleeding had something to do with the brake switch/biasing valve. as in if done in the wrong order an internal spool would shift and block fluid. (something about preventing complete fluid loss if a line broke). doing a quick read of the shop manual, I didn't see anything like that and I this quirk might have been for some other hydraulic system.
So my comments are probably completely in error and not worth the trouble to read
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