You are correct... he had only about 6000' at best to roll wing level, stabilize, land, and stop on rwy 18R. I don't know anything about the Premier's abilities, but it was certainly tight. Even the other guy in the pattern supposedly questioned tower's clearance to Roush.
Yes, he overshot. Very fortunate he didn't take out performer's aircraft or people.
I wasn't looking when it happened, but went over to the Performers Tent the next day, and looked at the site.
He crashed proably about 1000' south of the P-2 intersection, right of 18R.