Yikes !! I stuck to the 'fun in the sun' climbing only. Not a fan of worrying about the climbing PLUS my belayer freezing to the point of dropping me. lol.
I don't know anything about Hide Glue. I'm under the impression the tensile strength is based on the fibers only, so maybe your talking about wear resistance for those non turning pulley points.
More ropes is better. But I guess that implies pulling those extra ropes at angles just to maintain space for the pullers. If you do the geometry and force calculations, when you pull at an angle, the parallel force vector in line with the direction of the moving stone becomes shorter. Its another factor that when combined with the cumulative affect of all things influencing the force required, becomes alot more than just the weight of those stones.
If you start with 2.5 tonnes, and then add shorter force vectors of half the angled rope pulls, then add the friction of what the rope is rubbing over, and the friction of the wood sleigh over the ground, I suspect it adds up to alot. Even if you come up with friction reducing lubricants and smooth surfaces, those lubricants have diminishing returns the more significant the friction force is. Another non 1:1 scalable factor in the analogy.
Its just my opinion and instinct, but non of those pictures are demonstrating realistic numbers of men pulling to move those stones. Not even by half I suspect.
1st pic: I suspect you'd need at least 3 times as many maen to move those blocks in the context of that pic
2nd pic: I highly doubt those posts would be used for the pulling. I imagine their only value harnessing that friction to their benefit, would be only to hold the blocks in place after each upward pull, and they'd probably have the ropes wound a few times around those posts.
3rd pic: I suspect you'd need two 16" tree trunks minimum and a team of pulling men equivalent to the gang of men on the first pic just to lever out that block, and it would be in surges of say 6" at a time followed by putting spacers behind those trunks to maintain the optimal angle for the pull as nearly perpendicular to the ropes as possible.
But maybe I need to watch vid of people pulling heavy loads with ropes a bit to refine my instinct on those presumptions.