I certainly placed a 4 camelot near the lip of the roof on the crux pitch, though it's probably not mandatory. Sure made aiding it easier!
I am glad we didn't do blade ridge based on your description of the approach! It was really difficult to find much information about getting to the bottom other than that you scrambled down the forest chute and then wandered next to the lake until you got to the base of the blade (which was meant to be very difficult to distinguish from the other blades).
I'd second the call for helmets as well. The last place you want to get brained. I would also recommend double ropes (50m doubles would be fine, we had 60m ones and the extra 10m wasn't that useful from memory). We didn't carry bivy gear but some light weight bivy sacks wouldn't be a bad idea, especially if you're doing blade ridge.