I might be unclear on Sybil part, but I mentioned what you pointed out, especially Sybil with split accounts.
Downvoting and n^2 are all shown in the white paper. I also remember in the beginning steemit has downvote button next to upvote one, but didn't remember why it was disappeared.
IMO, n^2 system surely prevent self-upvoting but also makes people to follow whale's voting. Also given the uneven distribution of voting power, as you mentioned, it makes the game more unfair and complex.
One of the most problem of n^2 curve is helpless feeling of minnows and dolphins, which bring about less incentives to buy more SP unless it is hundreds of thousand dollars. Many people realized that buying hundreds dollars of SP never meaningfully increase their voting power. In this sense, I like @snowflake's ideas of voting cap.
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