For all of those dissing Mutai for running "slowly" at altitudes of 8000+ ft, you have absolutely no idea how altitude affects pace. To put things into perspective for your average weekend warrior (which is probably 80%) of the LRC community, I'll share my personal experience.
A few years ago when I was arguably in the best aerobic shape of my life, I was routinely (twice a month) running half marathon tempo runs at 74-75 mins. a pop. Race pace was sub-70. After working like a 1850 mule, averaging 50-60 hours a week at the j. o. b., I decided to take a little vacation to Greer, Arizona. Now, northeast Arizona's altitude is nowhere Kenay's highland region, but it was at least 7000 feet of crisp, thin air.
During a regular 1 hr run, I was curious to what pace I was hitting on a fairly flat course. There were some small steep hills, but noting along the lines of "hilly". After getting back to the cabin and checking splits, I couldn't believe how slow I was going, at a HR of around 160-175 bpm. While normally hitting 6:20-6:40 during a recovery run, at this particular altitude I had run roughly just under 6 miles (about 10:15/mi) for 6 miles. Shocked a bit discouraged, I had a totally different level of respect for altitude.
5:30 pace at 8500ft is mind-boggling; 8 minutes is definitely closer to 6 flat at sea level than most would believe.