Thanks for all the tips. Camp out went smoothly. It went down to about -10F, but I was never cold, maybe my face a little bit. The hardest part about getting through the night was some guy in the shelter (Feldspar Brook Lean-to) who was snoring. I had an EMS 0F down bag and a North Face Flight Bivy. Seems like all the reviews of bivy bags were split, "this bag is awesome" or "this bag sucks and I was soaked due to condensation". The bivy worked fine, I did not zip it up all the way, there was some condensation but it ended up as ice crystals, so no problem.
So camping out was totally worth it, because you can bag summits late in the day. We did Gray and then ended up on Skylight at 5:00 pm to watch the end of sunset. Here is just one of the views of Marcy:
Did Redfield in the morning, but could not get Cliff. Had very little water and after breaking trail in a foot of fresh snow on all three peaks it was time to call it.