Even if it owns 50% of the total ETH supply, just having those addresses means nothing. You can even find more here. I hope you understand my point.

@Op, Since you are talking about password, you need to be more specific. I'm reminded that ETH has several options to access if you are using MEW wallet, one of which is by importing the keystroke+pw file. Or you actually using a specific custodial wallet (email+pw).