Two groups i recall who insisted on fighting as a group regardless of the number of opponents they faced were the 3 Dao Elder Monks in HSDS and the 7 Jiangnan Freaks of LOCH.
Their argument was that they would fight as a team regardless of whether they outnumbered their opponents or if they were outnumbered.
Was this fair? It seems rather unfair for opponents who are alone like ZWJ was some of the time when he faced the monks or when the 7 Freaks faced Mei ChaoFeng. It is very well for them to disadvantage themselves by facing enemies who are numerically superior but it seems that outnumbered opponents have this disadvantage forced upon them.