Sven, you are reading tier1 incorrectly. According to Sirken's proposal, tier1 means you kill Trak, CT, Inny, and/or VS against *only* other tier1 guilds for the first 8 days of the month, then the rest of the time all targets are FFA. Tier1 can still decide amongst themselves to rotate or FFA their T1 mobs, but they do not have to worry about tier2 killing them for the first 8 days.
See this graphic explanation:
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