When we did this many, many years ago, I don't recall needing (or bringing) any rock pro; it's just 3rd class. Up above, if the 'shrund on top of Curtis Glacier is covered up, you'll only find kinda steep snow. We were there in early Aug and had to climb down into the melted-out shrund and then up the other side with only long ice axes and standard crampons (not really recommended). Guess you could take pickets but if you're reasonably competent on snow, you probably don't really need 'em.