"chionophile;c-2200926" wrote:
A: CG_Miller - We've looked into this in the past, and the task is bigger than most players realize. Once you register for the GAC we start the process of building the matchups immediately, and you can imagine the havoc one would wreck if players could drop in and out and in and out of the GAC while the game is trying to do some matchup heavy lifting.
While "the process of building matchups" may start at join it does not end there.
I have tested this myself:
* joined at the start of a 24hr signup window
* claimed a feat about 30 mins from the end of the window which promoted me to the next league
* ended up in a bracket full of players from the higher league
Ergo I was assigned to my matchmaking bracket only after promoting myself, about 23 hrs after clicking join.
