To name a few? Closer to name them all.
But even so, just being 6'1" to 6'3" does NOT make you a tweener. being a 6'1" to 6'3" OFF GUARD with a scoring mentality does. Trying to deny one of THE classic differences between NBA players and college players is just...wow.
Harris was a PG in college.
Nelson was a PG in college.
Have no idea what Barbosa was for Brazil, but he was considered a PG from the moment he hit the NBA so I'm assuming that's where he played overseas too.
Head may well be headed down the classic tweener path blazed by the Juan Dixons, DaJuan Wagners, Eddie Houses, Troy Bells, and Keyon Doolings. He is certainly no PG.
That leaves these 4: Arenas, Gordon, Jones and West. That's nice but hardly paradigm shifting. Of the 4 West is actually the guy who makes the best arguent. Arenas is obviously a special Iverson-like talent. The rules don't aply to guys like that. They come in all shapes and sizes. Gordon is headed down the Mahmoud Abdul-Raul path -- a proloific scorer unable to secure a spot precisely because he is a small soft OG and cannot learn the point. And Jones a) cannot secure the PG spot on a PG troubled team; and b) is really like Bobby Jackson in that he does it through superior physical skills and muscle. The rare useful tweener because he's actually strong enough to body an OG. West though would be the pleasant surprise. A too small college OG who actually learned to play the point.
There are two "breaks" in basketball positions regarding roles. PGs stand alone as distributors. OGs and SFs are interchangeable finesse/perimeter scorers. PFs and Cs are interchangeable as big interior rebounder/defenders/post players. Crossing between 2 and 3 is no great transition, although 3's with insufficient ball handling sklills can struggle. Crossing between 4 and 5 is no great transition. But crossing from the 2 (scorer) to the 1 (distributor) is a HUGE jump. As is crossing from the 4 (power) to the 3 (finesse). Those are the jumps that have doomed more college standouts than everything esle put together. In the pros 6'3" 175 is not an OG unless you are a HOF type talent. So in order to play in the league you have to go and cross a vast philosophical divide and play the game in a radically differnt fashion. Few can pull that off.
The knock on Harris coming in was that he didn't have enough experience to play PG and had a scoring mentality. Nelson was credited more for his PG skills, but he still had a scoring mentality. Besides, Douby played PG in college, just like those guys. Jason Terry is another guy I forgot to add to the list, by the way. Of course there have been some busts, but there have been plenty of hits. West, Harris, Barbosa, Terry, Arenas, Gordon, Steve Francis... even going back to Iverson, the tweener pioneer.
I really don't see why the backup PG has to be a distributor. The Kings have quite a few people (Bibby, Miller, Artest, Garcia) who they can run the offense through. If Douby were being brought in to be a starting point guard, or if the Kings depended on their point guard to run the offense you might be right. But with the personnel the Kings have, I don't see why the Kings can't have a scoring backup point guard. Look at Bobby Jackson, Tony Delk, Vernon Maxwell. Or, look around the league at Jason Terry, Gilbert Arenas, etc. No one complained then that those guys weren't distributors and pure PGs, why complain now?
The new handchecking rules prize one-on-one play more than ever, and Douby gives the Kings a guy who can get his own shot and shoot well from 3. That's going to be more valuable than a plodding distributor (Marcus Williams) or a good defense-no offense player (Hart, Rondo).
You're overblowing things with your "breaks" between positions. Who says your backup point guard has to distribute?
