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Considering the fact that all the freestyle events are regularly won with the same stroke, the same stroke that all the records were set using, the same stroke that 6 year olds race freestyle events with for the most part; the crawl is obviously the fastest and most efficient stroke for the vast majority of competitive swimmers of the human persuasion.
The DM swims are not a rescue swim, and you get more points for faster times, up to a point. The requirements for PADI DM swims are so easy there are some 80+ year old guys in the USA who could pass them, and some 75+ year old ladies in the USA who could also pass them. With 193 sovereign Countries in the World, many with residents who are not as out of shape as those in the USA, it is likely that right now in the world there are hundreds of men and women over age 75 with no scuba experience whatsoever who could pass the PADI DM 400 swim and 800 snorkel without any preparation.
Some of those just might swim the side stroke, but none would swim the dog paddle.
Yes, I agree that the crawl is the fastest. I also agree that the DM swims are not rescue swims, they're for speed--therefore if those fast old folks you mention have no scuba experience it's irrelevant. I do feel the tests SHOULD be more geared toward rescue, as that is probably the only time you'd really use them--including self-rescue. But that's another topic. Re the old folks--they most surely would be swimming
very regularly to knock off the tests. I'm sure there are considerably more young, very in shape folks who know how to swim, but couldn't finish one pool lap of the 400 if they're not in swimming shape. And one gets that way by swimming--lots.