From the live tv show, it seems it's not chance. They work really well, study the route and choose the best way, whereas all other guys made mistakes in navigation (and more especially in bikes, where Coma took a decisive advantage).
Al-Attiyah, Roma and Peterhansel stayed stuck in sands too today.
And in bikes, Gonçalves and Farres bikes burnt ! It's due to blade of dried grass which were blocked in radiotar, and with warm burnt ... and destroy bikes ... it could have been dangerous for riders !