Which of the most played commanders have you never used OR played against?

As the title says. I was inspired because I have the Cavalry Charge PreCon and was thinking of upgrading and playing it. After looking at EDHREC I saw it was #40something. Looking more at the list above that I realized that I had actually played against and with very few of the top commanders. Anyone else experience this, or do I just not play enough (definitely a possibility).