Cyclocross Magazine article on the race:
Another Serving of Texas Gravel, The Castell Grind 100k - Race report, Photos and 100k Full Results - Cyclocross Magazine - Cyclocross News, Races, Bikes, Photos, Videos
Looks like it was won by a guy on a cyclocross bike who barely edged out a guy on a Slate(not that that really says anything about what's best for that course.)