This address sent 25,160.31 BTC to coinbase a few moments before this dump. Was he the cause or did he have information about this possibility of correction?
that doesn't look like a transfer to coinbase to me. 3D9Gi4JsBaFRfyyDHiC3QM4o3zreV6oD4G (the recipient of the 25k BTC transaction) is part of a Xapo.com wallet. i don't think these coins were dumped.