This is Dyanmic Que in a nutshell.
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My rant about Dynamic que I just had a game where my enemy team was able to have all their selected main roles. While our team had 4 jungle mains awesome. Not only that but they had a Plat 1 against plat V and IV.
Proof: http://imgur.com/a/Z8qKB
How is this even possible I just don't get it its a stomp.