It's black and white with no room for debate here. He buys up, stretches his economy thin, and has teammates constantly buying for him, often being op's. This part isn't subjective, just look through the rounds and see who has how much money and who buys who. I clearly remember in previous tourneys too where they went like 4 rifles and one sheriff on a buy round when 5 rifles could have been afforded, and the one guy who went sheriff buys op for him round after lol.
It's also not subjective that this guy simply doesn't entry as much and avoids risking a higher chance of death onto site. Simply go through rounds one buy one and count them up, texture vs kk. Again, these things are black and white with no room for debate.
What is subject to opinion though is the impact of those kills (even tho he wasn't even the highest rated player according to rating system). But as I said before, the raw stats don't really show in my opinion how much more impact Gen.G duelists had on the game, actually entrying sites and setting their team up for success rather as seen in the results of the game and the ease at which Gen.G was able to take sites through coordinated entries and win through good post plants.