What a load of shite...yeah i prefer the shin tucked behind the head using the shin to help push/break the posture of the neck from coming up i notice all top level guys do ti too usually beginners try to throw both legs over and its much harder u have much more mobility as well with the shin and can hit it a lot faster as well
tbh i never really tried to do belly down armlocks in the past only from closed and mount or side its something im starting to use more
also with the nog vid guys wernt near as good back then most even ufc guys were low level blue belt on the ground thats why people thought nog was like the bjj god of mma when in reality he wasnt. nog went to Ireland and rolled with a blue belt who smashed him who was a hw in just rolling and even frank mir isnt even all that amazing roy nelson beat mir in bjj and we all know what mir did to nog....