Ahh the good old days of Gracie Jiu Jitsu!...
On any given day you could be called upon to represent Gracie Jiu-Jitsu in a bare knuckle challenge match.
How you train is how you're going to react in a fight.
Butt scooting, inverting and so many other things you see in modern jiu-jitsu exist because people have forgotten the true purpose of jiu-jitsu. The basics is what works! That's why I teach the basics taught to me by Rickson Gracie.