Yes, that clause might be somewhat important in its context. Rusty's sweeps were very influenced by Becker (of whom I'm guessing you're somewhat fond) and seem to take them in the next logical step in the progression of the technique, not in that they're faster or harder but in the fact that he's incorporating tapping and 4+ note per string technique (the latter of the two seems to be turning into the next fast playing/legato/tapping/sweeping in the cutting-edge shred trickbag). I'm personally having trouble with things that require a large stretch between the second and third fingers, especially when no such stretch is required with the other two fingers (even on high fret H-W-H patterns), so while I may have general sweeps down at a given speed I'm not always able to finger other parts of a sequence.
Jeff