"Never said that this is the only way to shoulder a rifle this is just the fastest most fun way that I know of from this position."
Right, I was impressed with the speed and re-ran the tape a few times to look at what you did, both in admiration and with a little nit-picking in mind. Nonetheless, "most fun" doesn't seem like it should be the criterion.
"The biggest mistake you can make is to only be proficient in one carry method."
I'm not sure I buy that. Obviously if one caries 20 different ways, one needs 20 different proficiencies, 10 or 4, depending on the number of ways. It would be bad to carry 20 different ways but only practice one. But it would be better still to carry just one way and only have to practice one way.
This gets back to bear security vs. prospector juggling. If you are putting on bear security, I don't see why you need to have a slew of different carry options. I can see how the gun may end up in a ton of different places if one is ballancing a shovel, pan, geiger counter, frying pan, who knows what. But If I was guarding biologists in Churchill, my one frame of reference, I don't see why my gun should be out of reach or in various positions.
Also it comes down to guys who can carry pistols vs. those who can't. If all you have is a rifle, and if there is really a bear situation at hand, then it means being wedded to the rifle in some way.
Just my current thinking.