I think it has more to do with the specific country's start time for games. For example if Belgian games start at 7:35 pm and French games start at 7:30 pm, it's a good bet France will get its training update first and Belgium second, even if France can be considered further west, while still being in the same timezone.
"Air is beautiful, yet you cannot see it. It's soft, yet you cannot touch it. Air is a little like my brain." - Jean-Claude Van Damme