With the addition of spell crit to Conviction and Sanctified Seals, you'll see almost every raid specced Holy Paladin going 18 points in Retribution, thus getting Imp Might in the process. Ret has a far easier time sparing the five points for kings than Holy at the moment, since most of the excess in Ret is pvp/solo oriented.
Ret can provide Kings to all melee classes, while Holy provides the Imp Might.
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