There's the "football smarts" element of OLine play too, not just the "monster skill" side. I don't know anything about Chan when it comes to this, but Braxton Cave almost didn't get it enough to get on the field, even though he was by far the better physical specimen. As Coach Kelly said when comparing his two centers at the time: When Braxton blocks you, you stay blocked. He just doesn't always block the right guy.
We tend to look only at the eye-test physical "candy" of some of these guys, and there's always more to it than that. (Again, I don't know what Chan's issues are as to getting on the field other than there are a LOT of really good OLinemen at ND.)