Incorrect. IGN had this wrong too. Luke Evans and Gina Carano do. I checked the credits.
Still 2 is a bit generous. I found the AI can't drive or shoot. A couple of the levels seemed near impossible without co-op. There was also that quarry level near the end where the AI driver tried to go back up the quarry but attempted to do so by diriving directly up the side of the hill and getting stuck. After getting them unstuck myself and switching back to shooting they did the exact same thing again.
One of the really big issues is a movie spoiler so I can see why it wasn't included but I'll point it out here...