I'm planning to run an Exalted campaign using 4e D&D rules sometime in the near future.

*GASP*

I know, I know; I love Exalted's fluff but am much more comfortable with D&D's rules. Anyway the fluff is all a bit much to absorb and put into context, as I've only played a short pbp Exalted game as a heroic mortal player. So I'm hoping you all can help me put all of it into context and fill in a couple of holes. I only have the basic 2e game book, and I'm highly unlikely to make any gaming purchases in the foreseeable future.

Q1: What's the purpose/niche of the Lunar Exalts? The book says they're the solars' warlords and mates, but those seem to be redundent roles. I mean, Day caste solars make perfect warlords and while an entire breed of harem exalts might be fun to imagine as this:
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that doesn't seem a proper justification of their inclusion.

Q2: What's the deal with Dragon Kings? Are they oriental-style dragonborn? And how could they have died by the millions if they were all kings?