I'd say, then, that for the purpose of block-capping, if you know you have a DK in your raid, think of the block cap as 100%, rather than 102.4%.
52.08 dodge = 1% agility, so the horn of winter gives about 3% dodge
before DR. 2.4% after DR is probably a safe bet, so that's why I rounded off to 100%.
This of course doesn't count druids, who give another 37 agility, but that's another story.
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