This is a privacy centered forum so you can't determine who is a "big shot". But there are members who have been handing out loans for a long time on the forum, one of them is DarkStar, who doubles as the campaign manager of Chipmixer; which is the highest paying campaign on the forum.
Here's a link to their loan thread - https://bitcointalk.org/index.php?topic=3243635.msg33783049#msg33783049