Carr made the Pro Bowl as an alternate last season, replacing Aaron Rodgers. That was while the Pro Bowl was still unconferenced. They went back to the old AFC vs NFC format this year and Alex Smith was the next up in the conference.
Mack also recently bowed out of the Pro Bowl due to an undisclosed injury. He was replaced by Jets defensive end, Leonard Williams.
Smith is one of two Chief alternates to be named to the Pro Bowl as an alternate. The other was punter Dustin Colquitt, somehow got the call ahead of fellow alternate Marquette King to replace Pat McAfee. Could it have anything to do with Andy Reid being the coach of the AFC team? Who knows.
In total, seven Raiders were initially named to the Pro Bowl with seven other named as alternates.