Try it maybe?? Seriously, just experiment with what works and is comfortable. That back leg straight works well if you're shorter but imo if you're 5'11+ its easier to crouch somewhat. I'm 6'2" and have always kinda squatted a tad. Straight back leg never was right for me. Mosconi, btw, was a LITTLE guy. His stance is fine if you're that short.I’m 6’3” and was wondering about how to use ‘back leg locked’.