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Aha! In the dedicated thread there is quite a debate that follows the build regarding exactly this topic. Apparently the initial attack never loses the lightning keyword, because the Brutal Barrage isn't dealing Lightning Damage. The key is found in the Tempest Whetstone wording

Tempest Whetstone:

Power (Consumable • Lightning): Minor Action. Touch this whetstone to a melee or ranged weapon you hold. Until the end  of the encounter, any successful attack with the weapon deals an extra 2  lightning damage to each enemy within 2 squares of the target; the  target of the attack does not take this damage.

The Whetstone bestows the Lightning Keyword without doing Lightning Damage to the primary target. The Crown does not specify that Lightning Damage is changed, only that the power has the Lightning Keyword. Thus the target is hit with an attack which has the lightning keyword (Mark of Storm justified), and the damage becomes Radiant (via the Crown) which justifies Burning Radiance.

In the aforementioned thread Melos also brings up the issue of timing, to which langeweille only responds with "that's simply not how it works." Not the best argument, but langeweille cites the Arcane Slasher build (which I'm not really familiar with, except as a basic concept) as a specific example among many from this forum. While I think there may be a valid issue with timing, my question was never one for a stand for or against the build, rather simply a request for clarification, so...

In the end, I'd be willing to allow it, I believe, in a game I were running, even if it is a little shady. There are issues with it's admission as DPR goes (namely the use of Power Points, which was brought up in the original thread, and the use of the Whetstone itself, which constitutes the use of a Daily item power unless that has been changed) however the numbers are reasonable figures for at least the first 3 encounters of the day at 16th.

This build seems to qualify and isn't just a damage dealer either - stealth, skills, and leader capabilities:
Annie Oakley, Crossbow Entertainer Extraordinaire