Full i90 PLD should not get gibbed by Twintania from full HP.

[Shurrikhan]

Maybe you forgot 18% stoneskin on 7k hp vs 8700? And 25% lustrate.

Warrior simply scales better with WHM and SCH. And over 10k HP?

Warrior - 25% more healing from Lustrate due to health (by its own mechanics, I'm fairly sure Lustrate is unaffected by the 20% additional healing).
Paladin - 25% more effective health, always. Each point of healing is worth 25% more damage recovery/absorption.

10k-health Warrior - 2.5k healing --> 2500 damage recovered.
8k health PLD - 2000 healing --> 2500 (warrior-equivalent) damage recovered.

The exact same occurs for Stoneskin. Only during ToB does Warrior see (uniquely) superior health-based heals. I'm not sure why people point out Warriors as being superior in regard to SS and Lustrate when they are merely equal.