This reminds me so much of the whole Kip Litton spectacle. Nobody is asking for stellar reviews of Rob's character. ("Kip is a fantastic dentist-- took great care of my teeth...such a wonderful human being; he'd never cheat")
Honestly, it would be enough to have someone follow Rob for a span of 72-96 hours just to verify the legitimacy of this pace/mileage issue. I don't care how fast he ran for one mile of the 25 he ran with you, or how well caffeine woke him up. Twenty five miles out of 350 is a joke compared to an RV consistently moving 7-10mph with a Rob who is supposedly keeping up...after 1,700+ miles.
As others have stated, his less than realistic debut in ultra running also raised eyebrows because it simply wasn't plausible. Unless I watch it happen, I'm simply not inclined to believe anyone could jump in cold and negative split consecutive marathons the way he supposedly did, the last one in 3:19, during the course of 30 hours. That's cartoon fantasy material, not reality.