no, it's extrapolation. And I'm talking about Europe/West since that's the direction these threads seem to go. otherwise it'd just be 1-2 pages.
Have we not been extrapolating UK retail sales for the west or at least Europe for 8 months now?
Until a digital only game like Mania or Rocket League gives us hard numbers, we go off whatever data we have. (or if we get digital splits for a retail game)
So the data is:
Numerous indie devs say they've have good sales.
A few games with a WW sales number such as XV2 or Street Fighter, that did not chart especially high in any retail setting.
And knowing these games got to their WW amount without even being that high on the eshop.
Sept 2017 best sellers (NA, which I assume is one of the strongest territories considering it's DBZ):
10. Dragon Ball Xenoverse 2
Top 10 Best Sellers on the Nintendo Switch eShop (Week of May 29th) (USA, link has other countries)
4. Ultra Street Fighter II: The Final Challengers
(This is it's release week it seems)
If we get a November one it'll be interesting due to holiday legs for evergreens and a heavy hitter like Mario.
So this has all led to me a (seemingly highly controversial) conclusion that any game messing with that top 5 consistently is doing halfway decent.
What you said makes little sense and isn't grounded on any evidence. Its one thing extrapolating using actual sales, and another to determine how well a game does by its ranking when you don't know the numbers for any of the positions.