why dont people use safety grips

like frank shamrock does I notice he gets mounted he uses a safety grip never seen to many people do this and he rarely gets hit because of it plus his escapes seem to flow smoothly from the safety grip,most other fighters dont use it and just get pounded on or give there back.

explain this safety grip you speak of.

Is it anything like the guillitine in the Pride videogame where you can tap a guy who is mounted on you?

TTT

TTT

You mean the body lock with a chain grip?

What is a safety grip?