Post your opinion regarding that here.
not in rules? in for the restart (at this point after 2 rounds half (i would say 6) of the players are simply playing by collecting points for the reward code)
if u wanna keep the same mechanic (5 matches and no bo5) the only way to prevent quits/byes is you/any council member/staff member to play as a stand in (or whatever is the name of the guy that subs during trials for the last battle) with something like random marks, same number of your opponent
a bye in first/second round and with 3 players left is simply too helpful