I don't think too many folks truly appreciate the content of the videos floating around showing how Tim does things. There is a wealth of knowledge that took many years to achieve, by one of the best in the business.
Tim's method is pretty much how I grind most of my blades. I first learned it from Michael Vagnino AFTER I had gotten really comfortable "belly grinding," and it was actually harder for me to do for a long time. But once I got more time under my belt doing it and got a better feel for it, I came to really like this approach.
It is NOT a fix-all, nor does it make grinding a blade just happen on its own... but it takes some of the variables out and makes grinding more predictable and fast.
There are some blade styles that it doesn't work very well with, like the harpoon tip bowie I just posted recently. And while there are ways to work around the issues, I typically find it faster/easier just to belly grind a blade like that.
There is no doubt, Tim is truly a master!!! 
:thumbup: