those Yakuza Kiwami 2 numbers in the combined chart make no sense - the SKUs only have 47pts and gained 3

It's quite obvious the reason. I will show you with some examples.

PES2018 would be 05./0x. (020./0xx.) but that doesn't reflect Media Create numbers where we have PES2018 for last week at 10th position and with the possibility of going down. Additionally, you need to take into account the bias of Rakuten towards PES being the official sponsor of F.C. Barcelona (the team that appears on the cover).

The same for DQXIPS4. In order to match with the most similar positions with Media Create or even Famitsu numbers, we have DQXIPS4 at 06./0x. (021./0xx.) and we have that game at 27th position in last week's numbers for Media Create. It would be illogical to jump from 27th to 6th, so no point on charting.

USFII is a game that is being discounted by 50% on Rakuten, and using those games on actual rankings would be useless. I remember last year when Xenoblade X got a discount up to almost 1,000yen and was Top 5 for almost a month, and that didn't match actual charts from Media Create or Famitsu.

FIFA for Switch, the same. It would be 08./0x. (024./0xx.) (counting PES2018 and DQXIPS4, not counting them it would be 06./0x.) and that doesn't match with Media Create or Famitsu numbers where the game was 8th last week and is expected to drop, I don't know, 60% at best?, so it would be impossible for the game to keep that 8th position or even be up to 6th.

I hope this had clarified everything a little bit.

Comparison between FFXV, DQXI and MHW

My first attempt in making a comparison table. My apologies for formatting.