Figuring out who owns the btc addresses that received the multiple 1000BTC transactions could lay in the small amounts that are also received on those addresses.
Not really. People send these tiny transactions as a form of cheap advertising. Just scam the blockchain for the 10,000 most "interesting" addresses (most active, highest balance, most famous) and send them some dust from your vanity address.
Agree.
Still, how about the transfer that originated from Localbitcoins.com ?
Someone was at the sending end of that transaction, if he/she can recall who he/she was doing business with, who knows what information that will reveal.
Afaik, localbitcoins transaction are either in person in cash, or with bank transfer.
Does localbitcoins.com maintains a history of all transactions, if possible ?