Yall forget the West Coast was completely dead outside of Game and legacy artists? No label gave a fukk about an LA rapper. For example Bishop Lamont was talented and under Dr. Dre, but it wasn't happening. T.I, Wayne, Jeezy and Kanye had the sound the labels wanted, not no South Central LA.
That Jay Rock single came out in 2007 when he was a nobody. Game sold 350k first week in 2006 and 230k in 2008. He was one of the biggest artists in the whole rap game putting on randoms from LA hoods and giving them a large platform. Sure, the fact is that KDot eventually had to change his name to Kendrick Lamar and Jay Rock had to sign to Tech N9ne to make it big, but I'm sure both of them acknowledge these early beginnings as very important.