Kings don't really need a point guard. Petrie has said they need someone with point guard skills. Basically, they need someone who has the ability to bring the ball up past half court if need be. Bibby, Christie, Martin and Evans can do an adequate job of doing this and I think they all can defend other point guards(except Bibby

).
They could use another shooter to give spot minutes and I think Alexander could fit the bill. He can light it up really quick and I think once he heals from his injuries the Kings might pick him up. They might sign a "true" point guard just to push Bibby in practice.