Digital is easier to compile because it comes from the same source (only iTunes digital) compared to Walmart that has different sources (branches) so there would have to be an overall compilation for those individual sources to come up with the finale number. Is the logic difficult to comprehend, or...?
The word "should" represents an
ideal situation, may be the same or different from the
actual result, so I'm not sure what you're trying to point out here? I just said that it's easier for iTunes to compile digital sales, but it's also not surprising for Walmart to report first because it's not that much difficult for them either.