When UFC used to have knees and Prde FC didn't ! Soon as UFC cut out knees to a down fighter Pride picked them up but dropped elbows in it's place and UFC picked p elbows. Its always a trade war with them hahaha
UFC dropped can't kick a downed fighter , Pride picked up you could

never ending circle
AND NEWS FLASH the only reason why UFC aquired rules was when Zuffa bout the UFC and Dana White became head they wanted into bigger markets instead of having underground PPV on closed circit ppvTV which only a handful of States would allow.
Sure it hel;ped expand the UFC but at what costs? They had to have ties with the Nevada Stat Boxing commison and following under their rules of weight classes and rules and referring. Which utterly destoryed the any weight Elmintion tourneys they had. Example a 145 lbs guy could fight a 300 lbs guy ! I'm to tired but thats one example ! There is plenty google it!