Evans isn't really a pg.
Agreed. Although, I think someone like Rivers is the perfect type of player to put next to him. Rivers is skilled enough to handle the point at least part time, but also big enough to defend the SG. He also is a good shooter, so, he can concievably thrive playing off the ball when Evans is handling it.
Obviously, it is not the traditional backcourt, but in todays NBA, with the super athletic hybrids like Evans becoming more and more prevalent, they are going to need to find more ways to make these things work.