In my experience, against good guys, you have to control a cross sleeve/wrist and the leg at the same time, or else they will sprawl/crossface/limp arm, no matter how quickly/powerfully you do the move. I don't like just guiding the arm over like in the video, as you loose a lot of ability to manipulate their weight by hitting the armpit if you don't hold it. And to Zankou, I would argue that the sweep itself is most definitely going to work and IMO should be considered a go to if you can control both the far leg and wrist. Dean Lister and Caio Terra are both big on this move, as have been some of the best leg lock guys I've ever trained with. Works very well from half butterfly (where I use it) too because your leg is already partially circled in.