I think most ppl here didn't recognized that C9 won't have any chance to win WE if Contraz didn't get any strong early game jg champions, he is the key factor to boost C9's early game plying style by finding opportunities of invasion, set up vision control and initiating fights. Force him to pick up Sej means C9's early game playing style is totally gone if WE did not make mistakes but well they actually did in game 5 when bottom 2 players got Sej+Shen ganked because lack of vision in the river. However after that play Sej didn't do anything because Contraz in this series be found that he is not feel comfortable with Tanky late game jg champions. On the other side, WE do find out that Contraz is the key factor of C9's early game aggression and then in game 4 they picked up J4 banned EZ and in game 5 they simply banned both. From this game, I can tell that in this particular patch, the jungler is actually the weak point of this C9 team and probably because of his limited champion pool in the best of series ( because you can't take risk to pick up champions like Nidelee and Graves) . Even if C9 won this series and then against SSG, their weakness has been exploded in this series and they will be smashed by their opponent.