The polar bear Warrior and the other four decided to team up with Chris and the other 10 Masters who were all above SS+. However, for the seven SSS Masters, a single level was a qualitative difference.
The only ones who could fight one of the seven demons alone were the warrior and Chris.
However, Lucifer's strength was clearly underestimated.
He single-handedly took on Chris and the Warriors!
It directly restricted them from attacking the other demons.
After the two strongest players were restricted, the remaining six demons could easily deal with the 14 SS+ players.
The gap between a single rank wasn't something that could be overcome by an [A+A] rank.
Even an SS+ would be defeated by an SSS master within 30 moves.
The 6 SSS-class demons fought with ease against 14 SS+ class players who did not have any tacit understanding.