There is not a single part of my post that implies or conveys that is the only method. Of course there are other methods, all are fine and dandy. I was simply sharing the method of a particular player and educator, who happens to be very well though of. We use his ukulele in the classroom and some of my advanced students use his ukulele way, that was the main logic behind post, not to say that was the only method (which clearly I don't).
That also reminds me how everyone plays the ukulele a little different. With my own students, I share with them what I think is solid technique, that which will not cause pain, and be the most efficient way of musically expressing whatever they are trying to do, but many of my students find other ways of making it comfortable for them that look weird but sound great, and I tell them good job for being resourceful. For example, we had song presentations the other day and one kid used his thumb to bar the d chord (2220). It looked odd, and I didn't teach him that, but he transitioned smoothly into it and out of it, his was the best sounding d chord of the kids who had d in their song, and I thought it was cool he found a way of doing it for his own comfort. Considering this is a 7th grader it's even more
Impressive.
And so goes the triple strum. I'm sure the ukulelezaza books will show it a different way, and my own private teacher (Matt dahlberg) will teach me his own way. I'll assimilate all three and maybe find a different way that will reach my 7th and 8th graders.