The Wheel of Time on Supernatural

Did anyone else catch the Wheel of Time references in Supernatural?

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First was the symbol for Metatron, which is just reminiscent of the WoT symbol, but then they brought it home with this:

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Which made me rewind to verify that it actually said that.  Finally they had Metatron question Dean about whether shutting the gates of Hell was really the way to go.  Therefore I’m figuring that they will come to the same conclusion that Rand did that Hell/evil needs to be present in the world so that the world has balance and that too much of either side is bad.  This seemed like it was screamed at us last night so surely I’m not the only person who noticed.  Thoughts?