RGI is the most nonsensical, ridiculous and confirmation bias related stat created in the history of terrible, made up stats.
I counter RGI with this article by Travis Yost, who is actually great at what he does and thinks his his theories through before presenting them as "fact" and can't be demolished by anyone with half a brain.
http://nhlnumbers.com/2013/8/20/tough-to-play-against