Do you think he could have been more than he was? He had a great look, and Shawn Michaels tried real hard to put him over when they did the masterlock spot. So of course he gets fed to Cena who becomes the first person to break his hold.
If things had gone differently do you think he could have been more or did he already hit his ceiling? He wasn't great in the ring but maybe he could have gotten there with some seasoning.
The problem is that he was brought up WAY before he was ready. In the state he was in at that point, he had already hit his ceiling and he needed to leave and go learn new stuff. But then they never brought him back again.