Technically, column C should also account for the lag between stocks going ex-dividend and the dividend payment, but this should not significantly effect the calculations unless the dividend in question is a significant part of the change in your portfolio value on any given day.
With new money on the table, the result was a feeding frenzy as providers scrambled to put in place systems that would qualify them for meaningful use incentive payments, and avoid payment cuts that are set to take effect in less than three years for those that lag behind.