Prior to the bolts, I think people belayed at the lower ledge (as described in older Williams guidebooks). Most people these days would end the first pitch at the bolts (as described in the Gray Dick) rather than set a gear anchor.
So: there's a good small cam placement in the crack in the roof, as you described. My recollection is that once you're up into the left-facing corner, 5.7 leaders are unlikely to stop for gear until they get to the top of the corner under then next, smaller roof. There's a big horizontal under that roof where one traverses right to the the bolts (located where the other climber is in the photo, above the tree) with easy gear, but it's only a couple of straighforward moves to the bolts.
Good photo of that section.