I don't get the significance of the logins. The hacker logs in every 15 minutes. What are the chances someone who makes a trade with him logs in a few minutes a

I don't get the significance of the logins. The hacker logs in every 15 minutes. What are the chances someone who makes a trade with him logs in a few minutes after one of his logins?? I'd say the odds are pretty high... and that log doesn't mean anything.