I think the schematic is not accurate. Look at the 6th set of two people in the top pulling row. One of them is clearly facing back. This is the same with the 8

I think the schematic is not accurate. Look at the 6th set of two people in the top pulling row. One of them is clearly facing back. This is the same with the 8th such set of two. A lot of the heads in these 4 rows are difficult to make out. On the other hand the number of people looking back in the schematic is 0, 2, 11 and 8 for each row.