Preset algorithms try to gather in one group of competitors with the same number of participants. Even guilds with one participant are allowed to participate in the balloon race, so to such guilds the algorithm will try to gather players with one participant. However, sometimes the number of teams is not enough to form groups and therefore a guild with three members can be in a group with one member as well as in a group with five members. This is an acceptable situation that doesn't mean that a guild with fewer members is doomed to lose. Everything still depends on the number of people that will actively participate in the competition, on the number of victory points gained. And don't forget the prizes for passing the marks and for engagement. You can still compete for them.