Hmm, I think what Omen might be trying to say (and I could be wrong)is that you can be pretty competitive and get out and enjoy yourself at matches with stock equipment...so long as you choose the right stock equipment for YOU. Doesn't mean you will necessarily win; but you can do pretty well.
Of course if you want to win consistently then everything has to be dialed in; correct equipment that is properly tuned and modded to the individuals needs, correct technique, mindset, hydration, nutrition, etc. I think that the gun Omen chose is actually a pretty decent machine right out of the box, and happens to suit his style of shooting very well. Basically a CZ pattern gun with good weight distribution and a pretty decent trigger and sights.
All things being equal, top shooters with similar skill sets should always place fairly close to each other in competition, but the ones who bring the better overall "package" to the table are probably going to win more consistently.