I was also riding the pass on Sunday, starting on the McKenzie River side. There was a major bike collision on the Sisters side just before I got to the summit. I think you are correct that ODOT is saying the closure applies to all to avoid liability. I don't have details on the crash, I heard that a rider going down missed a corner and went off the road. Your pictures show what a FANTASTIC day it was for that exquisite ride. It was quite a party at the summit.