Actually, going back and looking at the tracker, not sure how much of a lead change it was as opposed to different time-points on the tracker. Right now, for instance, the Maserati position is 15 minutes after the Phaedo position, and even though the Maserati position report has them going...
For a bit, Maserati had taken a slight lead, and had a slight edge in speed (23.1 vs 22.8). Now, Phaedo has shot back into a little lead and is holding higher speed (24.5 vs 20.5).