I'm not sure you want to go down the Larry Cain path. Two things for thought:
1) the way he bends from the waist can't be good for your back unless you're built like a brick shothouse like he is. If I paddled like that I'd be on anti inflams for a week. It might be faster but looks terrible for ergonomics.
2) he's got a brace on his left arm suggesting a paddling injury to the elbow or forearm. Perhaps from canoeing. Perhaps preventative. Doesn't inspire confidence though....