Doubt anyone including me can put any odds on anything. You just will have to keep checking back to see if someone CXed and if by chance it was a Traditional room

OT-I made a res for a UA flight where if I was going to get to my destination in Sept it meant flying on only 1 flight on a Thurs, fare was way way up there and no Saver available probably never was. Lucky for me even thou the seat map showed all the seats taken UA was still willing to sell seats for top $$ or for Anytime Award.

I booked the Anytime award (still dont know how I didnt check to make sure this year wasnt another Only 1 date to fly and only 1 flight I can do it on). Anyway its Saver back, when I clicked on for seats it said none are available will have to get 1 at the airport = probably only middle seats in reg E day of. Well I kept checking back, and finally a seat was available reg E but a window(I prefer aisles and E+ which is free for me and on a 777 the middle section to boot). Rechecking the next week got me an E+ seat but in the middle, another time I was able to grab an aisle in E+ but not the middle section. Yes I still check from time to time for that aisle E+ middle section (UAs 777s PMCO is 3-3-3)

My pt is a person never knows when someone is gonna CX their res be it a hotel or flight.UA didnt open more seats for assignment for whatever reason those who had those seats CXed their res so UA made the seats avaialble for assignment since they now fell below x% of seats allowed to be assigned.

So you too will need to keep checvking back with Hyatt to see if anything opens up due to others CXing their reses. People do that all the time, either due to work or making other plans. Continue checking up until the last time you can CX what you have.