Ted, don't be silly.
Last Cup win at a non-RP track by a team that wasn't:
Hendrick, RCR, DEI/Ganassi/EGR, Stewart-Haas, Petty/Evernham, Penske, Roush, Yates, Gibbs, Waltrip?
Fall Phoenix 2011 - Kasey Kahne (Red Bull Racing)
Before that?
August Michigan 2009 - Brian Vickers (Red Bull Racing)
Before that?
Kansas 2004 - Joe Nemechek (MBV Motorsports)
Yes, Ted, clearly the smaller underfunded teams like Wood Bros, Phoenix and Front Row are just as competitive at non-plate tracks as they are at regular tracks.