Your numbers are all over the place and don't really make sense for what you're talking about. 3 plus two groups of 6 would only be 15 out of 20, so where did the other 5 people go?
But more to the point, if those 3 stop pedaling, or pedal harder than everyone else combined, or apply the brakes, or tip the bike over, any number of other things they could absolutely change the speed/direction of the bike.
Your "words wholly" includes more than whatever you think it does.
Has it? I think you're far less clear and careful with your words than you think you are. You've been arguing from the start that less than half of something isn't and can't be significant. We aren't even discussing the text in this study that you can read in the screenshot:
What you're saying now about “the traditional driver of USA birth rates” isn't reflected in your other comments.