It does not sound much, but 9 and 10 lap gaps are not easy to make up when in the first four, especially if in comparable lanes. The track is totally alien to any other out there, and so are the dynamics of the race as a consequence.
I remember when I was on Team USA for my second win, 12 hours of being behind DHORC and saying to Rick Burneson (of HOUSA magazine fame, and still the only man to have won this race and the FIF team race) that it felt as if we had been in second since the previous tuesday, which resonated and has stuck with him ever since. It takes several hours to move into the lead when in that situation, and only then, as was the case that time, if you are coming into good lanes as they come into bad.
Sometimes the event as a race is 'over' by hour 10, barring disaster, and then it is a case of battling the track and the tiredness. Maybe a better rotation would stop that being the case, but maybe not.
Right, gotta scoot now, for real...