I dont think this game has a huge skill gap yet, a lot of players on an individual level are really close. Some players like Tenz, yay etc are starting to put a gap between the next pack of players, but they can all compete with each other. Teams are similar, some are starting to get ahead on things like teamwork such as OG, Guard but they are all really close still, and any adversity can be a swing factor in games.
So I think you are right about any team beating another, and they are not all the same level exactly, but they are very very close still, with very few teams or individuals getting far ahead of the rest. I believe the game has a skill ceiling that causes this, it will always be like this unless game changes slow down in frequency.