This would depend on what exactly your argument is, as I must admit, I'm still a little unsure.
Can one player influence a game? Of course they can.
Can one player influence every game so they win. Of course they can't.
Does a platoon of 3 good players have more chance of influencing a game more then one player. Of course they do.
I think it's as simple as that. I really don't think you can argue against any of those statements, and if you do, you're wrong

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Btw, like I have said before - you get better by playing with better players (Puppet is still learning from me all the time...), this really is the best way to learn! Like Rojin says, watching can also help a massive amount.