There is no way in hell I'd take walker in top 15. There are reports saying he's closer to 5 ft 10 and he's far from a pure PG., more of SG. He's going to be 2nd/3rd guard coming off the bench, he's not a franchise guy. I'd get Knight over him he has the same prob (not a great passer) but he has the size, shooting ability and clutchness of Walker while only losing a little bit of explosiveness and speed.
BTW Knight will contain and out play Walker in this coming matchup book it.