The evidence showing how important it was for the Lions organization to retain offensive coordinator Ben Johnson this offseason continues to pile up. This time, football analyst Warren Sharp posted a huge series of charts plotting Expected Points Added (EPA) by team. On the horizontal and vertical axes, two play characteristics that ought to be trade-offs were used to show if teams were good in one situation but not the other. As a reminder, EPA is a statistical measure that attempts to convert the significance of each play into its effect on the scoreboard.