I can see how on a triathlon forum that would make that claim. I often swim next to triathletes who could go at least 10% faster if they would just raise their elbows and point their toes. They look like they could easily bench press their weight, but I'm doing one arm stroke drills and passing them as they try to power through the water.
BUT, once we're talking a group of swimmers that have good technique, the most powerful swimmer will likely be the fastest.....
For very lousy swimmers, it's definitely power sport :D. For elite swimmers, it's mostly motor activity. On average, I think it's more on the motor side.
I'd quibble over verbage. "Fine Motor" implies to me that the smaller muscles are used in the way that a surgeon or pianist or artist can coordinate smaller muscles to efficiently perform delicate functions. "Power" implies large muscles used to accellerate mass.
Swimming is technique-limited but requires strength and conditioning to apply. If you are not strong and fit, you won't be able to use good technique. If you don't have good technique, all the strength and conditioning you possess won't make you very fast. An example - core muscles must be strong to maintain your position in the water. There is so much else in the mix - flexibility, mental aspects, body geometry. Fascinating sport that can keep you learning how to improve your swimming for your entire life.
I am pretty sure that both Mark Spitz and Michael Phelps were relatively weak in the weight room compared to other elite athletes. Both had excellent swimming technique.
