Here's an article about Dana from April of this year. Leo is mentioned in it, in a part of the article it mentions that Dana was at Chippendales and he saw one of the male strippers and wanted him to work as Leo's security.
Also mentioned that on the night Titanic was nominated for all those academy awards that Leo was at Dana's house for a f$ck the Academy Awards type party. (My wording)
http://www.papermag.com/2014/04/the_lamb_of_wall_street_dana_giacchetto.php
And here's a recent comment from Dana about Leo.... He says that he thinks Wolf of Wall Street is Leo's best film. That few people know leo the way he does and that he loves leo and always will.
http://m.hollywoodreporter.com/entry/view/id/315333/i/2/p/0/?KSID=8b63b13d3d5fdc7941dfdbacafb0a597
Back to the stripper (Steve Stanulis) that caught Dana's attention, he was up for a role in Tge Good Shephard that leo was supposed to star in (Matt Damon starred instead) except things didn't work out because of the strippers connection to Dana and Leo's name is mentioned again at the end. (On the tenth pic of the slideshow)
http://m.hollywoodreporter.com/entry/view/id/315333/i/2/p/0/?KSID=8b63b13d3d5fdc7941dfdbacafb0a597
Just goes to show you may think you know someone but at the end of the day you don't really know the real them, what they're truly capable of, and if they are just using you for their own personal gain.