I think the math is deceptive. Because, yes, you have more hitpoints that are being scaled, but it doesn't account for how that plays out in battle. I did more testing and it always seems to work out so Cammy gets those hitpoints back.
I used Ryu and did 2 combos and a throw. I even did his multi-hit CA:
j.HP > cr. HK
forward throw
f.HP > DP > CA
This resulted in Cammy taking 751 dmg and Ken taking 757. So I guess you could say that it worked out better for Ken up until that point because he gets the extra 7 hitpoints total.
Then I did the same three moves in reverse order:
f.HP > DP > CA
forward throw
j.HP > cr. HK
The result was Cammy took 752 damage and Ken took 763. So Cammy took 11 less hitpoints and covers the 7 point difference.
Then I did:
forward throw
f.HP > DP > CA
j.HP > cr. HK
Cammy took 751 dmg and Ken took 763. So Cammy took 12 less hitpoints of damage and covers the 7 point difference.
Objectively, it Benefits Cammy more than it hurts her in this very scientific test (pushes nerd glasses up).
ran a super scientific test of my own. Only did it one way.
Ryu mp mp xx hp hadoken does 162 dmg unscaled
Cr lk is 20 dmg unscaled
Mp is 60 dmg unscaled.
Cammy gets barely overkilled by
Mp mp xx hp hadoken x 5
Mp x 2
Cr lk x 2
For a grand total of 970(slightly less since it's an overkill) damage total to kill her.
Ken takes the same moves in the same order, plus 5 more cr lks and lives with a little more than a pixel. For a grand total of 1070+ dmg required to kill him.
Bam, he gained more hp than she did from the scaling. Be it ever so slightly.
Edit below.
Redid it with a few different configurations and
F hp cr hp trigger st hk st lk hp dp xx ca does 507 dmg unscaled. Cammy dies outright to two of those(by quite a large margin, she's at maybe 10% when the second ca hits) ken lives and can take another 3 cr lks and stay standing. So he took 1074 dmg and kept trucking, cammy died at a hard amount to quantify but the ca only hit her 6 times and it usually does 350 on 7 hits so it did 300 unscaled. Took her aprox 964 dmg to tap out.
That's 1074 vs 964. A larger amount than I predicted possible so I'm assuming the ca had a weird interaction with scaling or I'm slightly off somewhere(that or we are slightly wrong about where/when scaling takes place and in what amounts). Test it and find out what I fucked up but I double checked.
Also did st hk cc into st hk st lk xx hp dp(311 dmg unscaled).
Cammy dies to that 3 times plus 1 cr lk. So 953 dmg unscaled.
Ken dies to that plus 7 cr lks. 1073. Although the last cr lk overkills so he's closer to 1053+ definitely not less.
So yet again it takes more dmg to kill him than her.
I'd do it using max dmg combos but I don't wanna reveal my secret tech and get people crying about 400 dmg meterless ryu combos. Lemme know if you find any that require less than 100 more dmg to kill ken. This has actually been pretty interesting. Sorry for the slight personal attacks, mighta been a little to rough.
@Rip Torn
Tl;dr 3 separate scenarios where ken takes more than 100 extra damage to kill than cammy.