Someone once said that, undefeated means you haven't fought the right person yet.
In reality it doesn't matter what any given person in any given MA did or can do, its what YOU can do.
Sometimes fighters are succesful in SPITE of whay they do, not because of it.
Natural talent and all that.
Other times its a question of picking the right fights.
Remember, the Gracies were undefeated until they became "public" annd there system was no longer a "secret".
Psalms 144:1
Praise be my Lord my Rock,
He trains my hands for war, my fingers for battle !