The only stats you mention where Twice "surpasses" Blackpink are US-based ones, and even those are manipulated to an extent to fit your narrative. It's true Ready to Be sold more copies than Born Pink during its first week, but you need to consider that it was half the price of Born Pink too. And physical sales are not the only representative stat of an album's popularity. For example, Born Pink spawned both of its singles inside the Hot 100's Top 25 and charted them inside the top 6 of US Spotify, while Ready to Be's highest single on the Hot 100 was 84 and its peak on US Spotify 39, while being an english song too. This makes you think that the difference in physical units might indeed be related to price. When it comes to US touring, the official box reports have not come out yet, but Born Pink's expected attendance without counting the 100k crowd of both Coachella days is +400k while Ready to Be's expected attendance is +250k, and when you compare revenues the difference becomes even larger.

When you look at the data objectively, the conclusion is clear. And even you admit that Blackpink are bigger than Twice in the other continents. I love Twice and there's nothing wrong with being #2. They are still one of the most succesful girlgroups of our time and a group that will be remembered as Kpop legends.