The blue system is NOT is 4:1, since BOTH ends are being pulled down by the red pulleys. If one end was fixed to a non-moving surface, or if the bottom blue pulley was attached to the top red ones it would be 4:1, but right now, it is just a double-line 2:1 (if you run 2 lines through a single hanging block and pull down , you don't double the purchase, you just have a bigger diameter line). A line can't have more tension in one segment than in another, and every block being pulled down has a resisting force of twice the line tension pulling up. Doesn't matter if the red line is cleated at one end or being pulled at both; for the purpose of figuring loads the cleat is "pulling" the line. Again, the easy way to settle this is to have someone measure the distance each part moves...