Sunday, July 25: started from Sheep Lake TH off 410 at 8am, lot was full at 7:40am, and a few cars had to park along the road. Some lupine, fireweed, paintbrush along the way, although not as exciting as the showcase at Paradise. Enjoyed the cool wind at Sourdough gap, good views. Bugs are present but weren't an issue as long as you keep moving. Few people on trail in the morning, a lot more in the early afternoon.
Route from Sourdough Gap: follow PCT past Threeway Peak, and then aim for the gully east of Threeway Peak . Once at top of the gully, facing the gully, you will need to navigate through the trees to your left.
Note there is a report in WTA on Jul 11th, the author was offroute, but did come down the correct route, which is also what we used to go up. The author included photos at the end to help with navigation.
Overall a very fun scramble experience. Pace is about 2.7mph, 5 hours car to car. You will see Rainier at summit.