G2 had a single game in game 4. Rest of the series, they got mostly dominated. Mad lion looked super good for the first 15mins in game 1, then they threw an almost un-throwable game and got fisted the rest of the series. Neither look convincing at all. You watched BLG in a single bo3. I watched all six bo5 they played in LPL playoffs and some regular season games because I'm a nerd like that.
I'm not saying that BLG losing to C9/GG/G2/MAD is impossible. Just saying, realistically, that cannot be the expectation whatsoever. If it happens, cool. It would be quite an accomplishment if any of those teams did it. But it most likely will not.
edit: Yep, 3-0. Like I said, that narrative was cope.