I've found that this kind of hierarchical taxonomy is never perfect, and often the cause of much wank -- you should see biology taxo fights, especially with new DNA evidence.
The more you worry about evenness and consistency, the more problems. If RPF doesn't fit, make it another top-level category rather than stuffing it into something else. Balanced trees are the hobgoblin of little minds.
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The more you worry about evenness and consistency, the more problems. If RPF doesn't fit, make it another top-level category rather than stuffing it into something else. Balanced trees are the hobgoblin of little minds.