I saw the video and was not going to go there as there are so many variables.. Here is the deal as I opin. The Obeche with the stoptail and rosewood neck was the loudest, (the last guitar played). The rosewood neck is denser (equals more volume and sustain). The other necks were mahogany. The stoptail has more wood than the trem ones, hence more density ( gains more volume and sustain). The player eluded that one would think the trem would have more volume. I dont know why. Less wood, more going on with trems parts, hence more interruption with sound trasfurence. I assume they all had the same gauge strings. Also he was noodling and not doing the same thing with each guitar and his attack was not completely consistent. Overall, far from consistent and far from scientific, which was not his extreme point, but to show the guitars volume ability and somehow went somewhere else it with it. What I get anyway from the video is confirmation of what I posted above. I dont know much, but I feel good about this stuff. Now, for added pleasure, throw a 2011 signature series with the sinker mahogany neck in the mix and it will probably be right there with that obeche rosewood axe.
I find only subtle difference in most tonewoods. I beleive it is there. I just dont know if it is a big a difference as it is made out to be. A higher density is my choice for all guitar necks, acoustic and electric. Higher density for back and sides on acoustic and electric guitar bodies. Just my 1 cent.