Noticed that Marco has "higher with zoan, even higher with hybrid form" yet the feats listed for his base form "contending with the admirals" were all performed with his zoan transformations active.
After fully reading the sandbox there's a few things that I think could be changed/added alongside my initial post:
Fujitora:
Stronger than
Trafalgar Law, as he was capable of casually overpowering him. Doflamingo said that even with his entire crew, it wouldn't be an easy task to eliminate him.
Law who he's stronger than is rated at 7-A+ as is Doflamingo and both of these justificiations would make Fuji above these two, meaning Fujitora should be rated "At least Mountain level+" instead.
Kozuki Oden:
Prime Rayleigh only felt confident in taking him on with Gaban at his side
[1], implying that he didn't think he could take Oden on alone
From the actual chapter I don't think there's anything suggesting Rayleigh was only confident fighting with Gaban or that he didn't think he could take Oden on alone, Gaban only said "should we nip this in the bud", which just suggests that they wanted to stop Oden most likely in the most efficient/quick way possible which would be together. Personally I think this justification for him can go.
Kaidou:
higher in Zoan Form, far higher in Hybrid Form or with Haoshoku infusion
I don't agree with the separation of Zoan form and Hybrid and scaling them higher than each other and instead think the two should be rated together. First of all there isn't actually anything suggesting that Hybrid is superior to regular zoan's in terms of stats, and the statement "his already-high physical abilities get improved even further" is referring to his Base form which was obvious. Also there isn't much reason to assume there should be a massive difference in general for example a boro breathe from Hybrid doesn't have any reason to be stronger than one from his zoan form.
We also see recently in chapter 1037 (Not suggesting any wano scaling only using this as proof there isn't much difference) that Luffy with ryuo barriers
struggles to stop and deflect a Zoan demolition gust yet not showing
as much issue against a Hybrid + Hao strike (Although admittedly he was in base against Zoan and gear 2nd against Hybrid it isn't much of a difference as Kaidou was using Haoshoku infusion in Hybrid but not Zoan), showing there isn't actually a massive difference between the two forms.
Also Hybrid and Haoshoku infusion shouldn't be listed as the same/similar values as Kaidou with infusion can and commonly is stacked on top of Hybrid making it undoubtedly higher than just Hybrid's rating alone.
So instead Kaidou's rating should look something like this "
6-B,
higher in Zoan Forms,
far higher with Haoshoku infusion".
Skull said that Kaido had the highest sheer battle power out of all the Yonko, which means he should be stronger than Whitebeard, Shanks, and Big Mom.
I agree with the statement, however, Shanks should not be included (regardless of if via the scaling Kaidou still ends up scaling above him) as Skull prior to giving this information states he couldn't find much information on Shanks. Meaning this statement primarily applies to Big Mom and Whitebeard.
Also as further support for the statement we should use the same justification of Oden's profile to support it where he stated "If I fail to defeat him, there will be no others who can stop Kaidou for a long time".