It's clear he's cuttin corners to make his bike as light as possible (note the hollow-pin chain and Juicy Ultimate brakes), therefore he's only running 3/6 rotor bolts to save weight. However, little does he [probably] know, 3 titanium rotor bolts weigh as much as one steel rotor bolt. So he could really be a lot safer if he just ran 6 Ti rotor bolts instead of 3 steel ones.