Basically the argument that Hauby can come out on top on the newer end game mobs is because it has accuracy, with letalis, I'm wondering if it would trump the hauby no matter what.
An interesting question:
3DA/4+sTP Armadaberk, Mars, Atheling:
24 Acc (32.5 w/ DEX)
11 DEX
44 Att (52.25 w/ STR)
11 STR
6 DA
4+ sTP
3TA/10Acc Valkyplate, Tyrant's, Letalis:
31 Acc (28 w/ DEX)
-4 DEX
29 Att (37.25 w/ STR)
11 STR
3 TA
3 DA
4 sTP
You're right to say that Letalis+Valkyplate is right in Armadaberk+Atheling's ballpark for mid-to-high Acc scenarios. Unfortunately (unless something comes along and really shakes up our x-hits) I wouldn't say that Valkyplate trumps Armadaberk no matter what, because Armadaberk will have 15 DEX and 8 Acc (19.25 w/ DEX) on the Valkyplate's maximum Acc set for the forseeable future. And without buff locking, there's going to be a lot more Aggressor/buff down fighting going on.
This is especially unfortunate because WAR's A+ Skill Relic is garbo for damage. Mythic and Empy are way better in that department, but without that 40 Acc in the Main slot to seal the deal, Acc is currently a big concern for GA users. So serious that RagnaWAR is holds its own, even at B+ skill rating.