Thanks for putting up these awesome videos, Denny! Much appreciated.
The "Filho" in that last video is slightly different than the one on pg 235 of Mastering the Rubber Guard. In the book, the headside foot goes in the bicep and the arm underhooking the leg goes on the arm of the opponent you are going to armbar.
In terms of nomenclature, do you think of the Filho you did in the video as the main "Filho" now or as a variation?
When you say "Filho" in your gym are you normally referring to the one in the video or the one in the book?