If Brooks' hip-flexor muscle is flaring-up again I guess he can't be trusted in the regular season, so it's no surprise to see him cut despite his strong start to training camp.
Sulak is an intriguing prospect and according to Rob Demovsky might be asked back for the practice squad (though that's not exactly saying much). The guy was drafted, and oddly cut before signing with the Raiders, I guess he had a uphill struggle to make the roster coming in with only a few weeks left of camp, but he might be one for the practice squad.