Found another nice example of a clear "transition point" where pace suddenly slows. Run marked 4:42 AM on Thursday, May 19, 2016, 4.5 miles in.
Shame, because he had averaged sub-6 for nearly 14 miles just a couple hours before. Anyway... you will see the buttonhook track is clear as day. ~6min pace before the buttonhook and then 14-17 minute miles. The chart is so clear. Appears like the transition occurred right before a populated area. Another highlight of this track is during the slow miles you see he actually cut a corner and continued to run on other side of road (5.3) and then cut back over shortly -- something i haven't seen at the ~6 pace (those seem to always be with traffic).
Something else interesting... Mile ~7.4 of this segment matches up to the FB photo Rob posted on 5/19 "Fore!! Coming through Arizona in the early hours." So, yep, for the 14-17 minute pace we have nice photo evidence of Rob out there. I am pretty confident he was doing these miles honestly. What is noteworthy here is what he is wearing.
He looks quite dapper in his Skins jacket. At this point he would have been running for about 1 hour and 24 minutes. Even knocked out a number of ~6 minute miles and climbed and descended some good hills (almost a thousand feet of climb). Clear sunny day, with temperature of 60 degrees according to weather underground. Wearing a jacket 1:24 into the run when it is 60 degrees and sunny with no sweat. Amazing. Maybe climate doesn't affect him as long as it is west of the Mississippi or the Geezers aren't around.
Excellent, haven't checked but we ought to organize these imgurs/posts in the Google doc if not already. They will no doubt do their own investigation but these will help