What does it matter if it's backlog or not? Those are sales. They add up, not only 1 week sales matter. Series gets more popular over time, anime helps, but you want to exclude the boost of the anime, ok.
So do tell me then: what is the average popularity in sales in Japan? Since 300k (physical copies only) seems it's below average according to you. NnT is super popular, not just popular.
TG without backlog sales? Go check again. The 2 TG volumes didn't sell 1,962,722, but 1,351,025, meaning the rest is backlog sales. Also OP includes backlog sales. Haikyuu had 3 vols.
ChocoBar9: Why are you bringing up Neverland? Did I say something about it? I don't really care which series is more popular, don't care which sells more. Don't go bringing that up to me. I commented on his lame "levels". In which case 300k is below average, which is news for me. And there is something you also forget.
All of those series include backlog sales on that list, its just that BC backlog sales were bigger during that period (for obvious reasons). Which again it doesn't matter, those are sales and the last 6 months show that BC manga was one of the top 10 most selling manga series, yet it "below average" in popularity according to him. That was I mocking. I didn't say BC sales per volume more than TG or OPM, but showed him that the manga in that period sold more (TG also had new anime in that period). So a series ends in top 10, but it's below average, sure.