Matt, any idea whether it was rockfall from above, or whether Big Grassy itself was the source of the rockfall?
It's been donkey's years since I was in Big Grassy (?1981). Back then I could sleep full-length on the narrow eastern end (albeit with one rock digging into me and the residual smell from someone's crap that I'd scraped off the ledge) while Steve got the fairly comfortable flat bit in the corner which was just a bit small to stretch out in.
I gather it's become less-and-less accommodating over the years and probably has finally turned the corner.