Not to mention that in terms of beer quality, a 3 hour difference in start time just doesn't matter.
However, the result is non-intuitive to those who have been conditioned to believe that absolute pitched cell count is everything. There is more at play here than any of us can measure at home. I have been looking for an excuse to purchase a DO meter. It will probably see as about as much use as my microscope (a microscope is a waste of money for a home brewer).