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Possibly, but there are other just-as-significant things the DK gives - 86 str/agi, anti magic zone for buttloads of magic absorption, self healing to rely slightly less on shaman heals, better ability to pull entire groups including magic users if need be (death grip and/or strangulate will make magic users come straight at you), a pet to temporarily distract a mob, and WAY more dps than a paladin to boot.
Not saying the DK is better than a pally, just that a couple pally buffs hardly make the pally a better MB tank.
Horn of Winter does not stack with Strength of Earth. It's an either/or situation.