The way I heard it from Matt Thornton(a Machado black), Rolls didn't invent the triangle choke, but re-discovered it in an old Kosen Judo manual. Apparently Maeda neglected to cover it when he taught the original Gracie students, or perhaps he himself was unaware of it being a Kodokan student?
Most, if not all of the techniques we generally think of as being BJJ-specifc existed in one form or another way back in the day, in the Kosen Judo schools who never gravitated away from the ground game.
Bottom line to me is, if it's just being "invented" right now, chances are that it's not going to be something that revolutionizes the whole sport and becomes a garden-variety, high-percentage move. Grappling is an intuitive thing, it's not nearly as intricate and complex as we sometimes make it out to be. If it's high-percentage, chances are it's already been stumbled upon in the past.
Ironically, I remember reading an old Judo book that touched on waxing and waning in popularity of certain techniques.
In Judo there is a core group of throws that are always there, the bread-and-butter throws that just plain work. Then there are others that cycle between obscurity and popularity, because when they are uncommon, few people train to defend against them. When someone dusts them off and masters one of those throws, they can be very successful in competition, and inspire other judokas to copy their moves thinking this is the new hot thing, the unstoppable technique that will bring certain victory.
But with more exposure and an increased chance of having to defend those moves comes more incentive to train how to defend it, and soon the hot throw isn't so hot anymore, and the reason it was obscure in the first place becomes obvious - it wasn't a high-percentage technique to begin with. And so it is again relegated to relatively little use....until people forget about it.