I don't know the whole story between @abit and @adm, but I recall that back when the network paid "liquidity rewards" to people who ran market-makers on the internal Steem currency exchange, @abit and his secondary account @adm essentially monopolized the liquidity rewards. I don't know if your transfer analysis includes market operations, but even if it doesn't, I'd imagine that he would have had to transfer money back and forth between his two accounts quite a lot to be able to balance them out.