Let's not complicate things. On this play, my LJ takes the spot from the HL and puts the ball right down. If we measure, we bring the chains across the field to that spot. Short and simple. Again, spotting the ball, whether it's the covering official's own spot or one he got from across the field, is not scientific.
Agreed. The easy way to remember it is that you only ever measure at the spot where the ball becomes dead (including lateral position). The difficult thing in this case was how H and L had to work together to get to it.
Doing measurements at the dead-ball spot will be a point of emphasis in the 2011 edition of the BAFRA/EFAF mechanics manual.