Terrific thread, and nice to put all of the hotel information in a thread of its own.
I'm a little confused as to the wording on Hyatt:
Hyatt
If you can demonstrate elite status with another chain and 10 stays or 30 nights within the past 12 months, Hyatt will comp you to Diamond status.
When you say "10 stays or 30 nights within the past 12 months", do you mean at Hyatt or at the competing chain?
I was comped top tier on Hyatt based on being top tier on Hilton, having had no Hyatt stays at all.