I would say that James more natural position would be the 3, at Texas they didn't have anyone else play the 4. Texas relied on James to be the primary scoring threat as well as rebounder.
As a Longhorn fan, I think Avery can become a great player but he still has a lot to learn. He had some rough patches throughout the season, a lot of it seemed mental. He is only 19 so he has a huge up-side, but I don't see him being an impact player in year 1, whereas I think Damion James would have a better chance contributing next year.