This is really only applicable to throttle mashers who get a rush out of digging trenches out of every corner. Of course someone mashing the throttle in every corner on a 900T or an 850 will not keep up with someone who can modulate the throttle and feel the traction provided out of each corner. A skilled rider who knows how to use the throttle will not be slower on a high power sled if the sled/suspension is set up for trail riding in my opinion. We all know a good rider will be faster than a bad rider no matter what sled they are on. The 600 ace I mentioned earlier we had a rental for a weekend (a guy who grew up riding with us but had moved down south and was visiting for the weekend) and we all thought it was a turd, because it was, but a good rider was able to stay close to the group on tight/twisty trails where top speed wasn't a factor. You basically just keep the throttle mashed to the bar the entire time.
I don't think anyone would argue that a skilled rider can will keep up with most people on a 900NA in tight/twisty trails.
Agreed, the "a good big dog will beat a good little dog" thing applies here.