While it's too early to say, this could be a lot like the whole afreeca vs SKT thing where one team doesn't take the other as seriously and thus the "underdog" wins a lot vs them (in the case of afreeca, apparently they have 6 straight series wins vs SKT). You can't also entirely blame ray for their "weakness", as not only did he bring something new to the table (first "korean/chinese-style" jayce game we've seen in the west) but he also showed that splitpushing is a viable option in this era where tanks are apparently superior. If I were CLG right now, I'd be studying all of this footage as this strategy be useful for them (darshan was literally only known for playing carries and splitpushing, and became one of the worst toplaners in NA when the tank meta hit) and could give them a few more win conditions besides "hope enemy team isn't NV/echo fox".