Yep that's part of it as well with him, but he also has some numbers Luke never had (assists, rebounds) and much better defensively. So he's a lot more than a 'glue guy' or whatever you want to call Walton. Walton was never an allstar or all NBA.
Yeah, that's why I said a much more talented player than Luke. The role is essentially the same, but Dray being a much better player has been able to do a lot more in that role.