I doubt I used it as the only piece, I probably used it as a directional. I can't remember.
I'm still confused, the anchor bolts have a chain and a ring and are a couple fourth class steps to the right of the redirect bolt. I can't imagine the scenario where the biner could be used for a retreat there.
That's most of the reason that I left it. It seemed like a smart move to leave a camo'd biner on the bolt that would be invisible from the ground but obvious when you come over the bulge. Then, people freaked out from the 5.9++rxxx moves will be less likely to miss it (since belaying from the bolts without the redirect would make a fall for the second at those free moves very swingy and very cheesegratery... I don't think that's a real word.)