Im assuming 'ahead of the herd' means anticipating a move correctly prior to other market participants seeing it?
In that case, the only way you can be ahead of everyone else is:
1. You guessed right
2: You know something no one else does.
#1 falls under the umbrella of consistency. If you can manage to be 'ahead of the herd' 55% of the time then it means that 45% of the time you are creating a one man/woman stampede in the opposite direction and getting eaten.
I thought what she meant was that edges go away when too many are trying to make money with them; sometimes they were never there.
Regardless:
Bot Destroyer in Traders of the New Era was clear that edges end quicker and quicker as time goes on. He is always on the search for new ones and in the notes to his chapter it was mentioned he backtests as part of his quest.