I concede your points in matching up elements of the LP to elements of the mono mix - they seem to be the same. But is it still possible the LP could be taken from the 70mm mix? After all, isn't the 70mm mix still an unknown variable at this point, given that we don't have a real copy of it? So we don't know how different or similar it is from the other mixes.
What I'm saying is, what if the 70mm mix has the same (or many of the same) elements that the mono mix does? It was also the first mix created as I recall, and if the LP was created early on and before the mono mix existed, then it would make sense that the LP's sound would be taken from the 70mm mix in that case.
All of this is just curious speculation on my part, so I could be totally wrong.
--SKot