Current: The last data pull. So it gives you a better idea of where the hero stands in terms of popularity/use at the moment.
Cumulative: All prior data extractions + the Current giving you a historical view of popularity/use.
I’m releasing a FAQ on how Hero Rankings are being changed in the Hero Utility, just need to get it up onto the server. Once it is I’ll send you a link to it.
I believe that the appear I was referencing was in the Top 100 defensive teams when the data sampling occurs.
Hope this helped! - RAZ