DD#1 started playing travel because she had so much fun playing all stars in 6U. She enjoyed playing multiple games and hanging out with her friends all day. DD#2 is playing 6U and loves playing but I cant see her going all day. She does pay attention and will move to the ball every play. After it is over with she will dance/skip/pirouette her way back to her position. Definitely two different kids.
DD 3 played on a co-ed soccer team in K and 1. The team was a bunch of kids all in the same school. At that age the goal was to have the kids facing the right goal.
One day they played against a team that had a young kid from a foreign land who could actually play. His family would picnic during the game while their kid ran circles around the American kids.
So, even at that young an age, there will be a few kids who are already showing promise.