Pretty sure SPS whale and dolphin are aggy. I know vugtis and cryptoeater are both individual players. I assume splinterlands is just a holding account for an SPS liquidity pool, or maybe that's the DAO account and gosplinterland5 is the LP account. Blockchainff, I believe, is one of the accounts of this chairman of the board fellow.
Maybe someone who is a bit more knowledgeable can correct me if I'm wrong.