I think the whole team is to blame for that. PooManDu had quite a bit to do with it, because if you're not in sync with your support and they're also rusty from the KR pro level of play you're gonna have a bad time. Vision was likely an issue throughout the game even before KT A started gaining that stranglehold. Bengi falling behind to other things didn't help with picking up the slack either.
I think they kinda screwed themselves at champ select, as they were very reactive in most of their picks. Eve was so Bengi could land a comfort jungler. Morg was to deal with Leblanc ganks, Renekton is a power pick with high priority in all regions, Corki was an attempt to push twitch out of lane, and I feel Karthus was an attempt to counter dives from Noc, leblanc, and possibly discourage a shen pick. The problem with this strategy is that their tankline depended on Impact and Bengi getting ahead, which Noc at level 3 can duel Eve pretty well toe-to-toe and force Eve to kite him out.
Now I won't take anything away from KT A's performance. They played an amazing game, combining picky champs with a strong global presence, making any picks onto leblanc turning into an even fight almost immediately. Countered the counter-pick strategy amazingly executed. I'll have to watch the full game to see how well the Thresh plays are as well. All they had to do was shut down one player into non-factor status, turn midgame teamfights around while split-pushing, wait for Corki and Renek to fall off and splitpush with shen to victory.