We are working toward a more detailed 'upvotes delivered' calculation that will look at the total rewards paid on a post and calculate the share delivered by our votes (using our pro rata rshares). In this case, 'upvotes delivered' would not count posts that had been zeroed out (as any pro rata % of 0 is 0). We do not have a scheduled release date for this visibility feature (we have been quietly releasing website updates, without fanfare, as they are completed).