This isn't really the place for a "how banner balance works" discussion, but since it seems necessary to defend Para's honor, I shall lay it forth anyhow!
There are 4 options for balance. They are numbered 0-3 for optimum confusion generation.
0 - No Balance (you pick green team? you're on green team.)
1 - Autobalance (Banners not included)
2 - Banner Balance (Servers set to this as default, except Duel / Strat)
3 - Battlegroups (Duel / Strat set to this)
Even if Para somehow had the power to change that setting (which he doesn't) those are the only options. There is no "mostly banner balance."
Banner Balance, however, will not create "unbalanced" teams. I use quotation marks because "teamwork" is not a measurable variable, so the computer cannot calculate it into balance. If the server is full, generally banners are more likely to be on the same team. It is when your banner is the majority of the server, or when your average "value" is significantly higher than the average on the server that banners are most often split.
I'll go to siege and get some screenshots, look for an edit, coming soon!
Edit:
Here you go. The admin panel portion relating to balance, revealed for all to see!
Note that Para and I have the same access level. He would get that same purple text message.