I may sacrifice league wins by not being in the cup, but I think I'll ultimately win more league games by not being it, for reasons I mention in my treatise.
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As for GMs being slow to fix bugs -- hopefully they're swift in fixing the unfair advantage D.5 teams have that I just exposed, and retroactively award my team the win. I still don't know how to access the mythical bugs forum so I'm crossing my fingers admins come here.