If one U7 dribbles nearly every time, is that actually a problem?

I would protect that instinct to dribble. At six, being confident enough to receive the ball and attack somebody is a brilliant starting point. I would not solve it by shouting “pass” every time a teammate becomes free. What I would start adding is what he sees after the first action. If he beats one player and the next defender comes across, can he notice that somebody else may now be free? Small 2v1s are great for this because he can still dribble, but the game naturally gives him a reason to use a teammate. You can also ask him afterwards, “what did you see when the second player came over?” rather than telling him the answer during the run. Keep the bravery. You are just helping him add another choice to it.