We did this route today, I'm pretty sure this is the top of P1. There are now 2 large and bomber hangers about head high straight over this configuration.
It's the top of pitch #1 jeezs no other belay on the entire climb has a lost arrow piton as part of the belay setup.
For this to be pitch #3 you would have to have started in the creek or I know maybe you started on grad boulder set up a zipline across the creek roped up for the -1st class scree ascent to the sub class 4 slab start belayed again here than proceeded to the aforementioned p3 belay cool.....
HAHAHAHAHAH just funnin ya it's the top of p1 fer sure.