I think you're on to something here. I was doing some brainstorming just last night and had the idea to monitor the exchange accounts for large changes in incoming transaction volume, with big increases in a short amount of time indicating that someone is likely getting ready to dump a bunch of coins. This would be done programmatically of course. DM me on coinfund slack if you'd be interested in collaborating.
RE: Top Holders of ERC20 Tokens