Are my mitigation numbers off ?

[Lyrica_Ashtine]

Yes, you're right, a WAR (or a DRK) shouldn't focus all on mitigation, and so is DRK. The problem is that, if they chose to, they could outdo PLD. On the other hand, if PLD decide to focus on DPS...they'll still be far below WAR and DRK. Oh, and by the way, even when focused on mitigation, WAR and DRK will also do more damage than PLD.

And remember, that, in your adjusted mitigation numbers, you still didn't include Holmgang and Walking Dead

You even mentioned it yourself that Holmgang doesn't mitigate anything. Holmgang and Living dead are impossible to calculate here as there are too many factors involved that I'm not going to bother to omit here. I'm pointing out you're mistaken on two ends:
1) Paladin isn't in such a terrible shape as you think it is in the mitigation department
2) You're using a scenario that's not only impracticable but also impossible

Edit:

Oh, nice. Long time I had news from him.
How do his children do ? You know, Lightning Storm, Ancient Quaka, Sacred Cross, Holiest Of Holy...

Now you're throwing in raid based damage as well? In that case, you're forgetting about Divine Veil here. And conveniently enough, the mechanics in that particular encounter makes groups stack up for a lot of things