It's really difficult to prove this.
The one thing I know, but cannot prove, is that the year we drafted him, one Wolfpack die-hard fan posted a video of all of his 25.5 sacks.
He was an edge rusher allright.
Even though I'm pretty sure he split the TE and the OT on at least one occasion for a sack; and beat both of them to the inside for another, he was still on the far edge.
This video here against MD clearly showed that he was an edge rusher, at times lining up wide outside the TE.
http://www.blinkx.com/watch-video/mario-willams-nc-state-vs-maryland/bk1ehqz1vaMDsU_wRMQGtg
I don't have his college game tapes, so I cannot dispute your claim that he was shutting down the run to his side.
(I have thousands of games scattered everywhere. Ya know I don't pull rabbit out of thin air like 'em magicians. And I don't mean to aim at you, but I do believe that when one makes a claim, one should back it up.)
What I know is that with the Texans, as time progressed, Mario saw many other positions on the line, including inside as a 3-4 DE (as opposed to what we saw in that vid.)
I do not suggest that he's to move permanently to OLB in the 3-4.
I'm only stating the fact that Mario has been playing both as a 4-3 DE and a 3-4 OLB (both on the strong and weak side) and more in the NFL.
Obviously, he was candid about what role he prefers not to play (2-gap).
In Wade's system, he doesn't have to worry about that so I don't see any problem.
We're not moving Mario to any strange territory, nor do we need to restore him to any place where he was "supposed to be" in college.
He's been making it very difficult to run to his side this past year (couple of years sounds more like it.) - This part I can "claim" because when the tape rolls, you can find all the different commentators doing our games verifying it as such.