Idle speculation on my part since I'm sick of studying for exams...

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Spoilers for Legacy of the Force: Bloodlines and Sacrifice, as well as Republic Commando: True Colors.

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When Fett finds Taun We, he "borrows" a whole lot of data from Arkanian Micro that we don't know if he ever looks at.

The Nulls go to Arkanian Micro to get their genome analyzed.

Perhaps Fett has their data?

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After he gets the information from Fraig, Fett starts scanning databases for the Twi'lek name Himar. But he finds Jaing/Jaing finds him before he can look through the list. Jaing says that it was a promise he made a long time ago.

A possible connection to Laseema?

And Fett's still got that data hanging around somewhere.

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Mr. Purple Armor (Graad).

"Fett was sure this was a man, medium height with his hands clasped behind his back. The left shoulder plate of his purple-black armor was a light metallic brown."

I've learned the hard way that Karen doesn't add description unless there's something important in there.

A clone? Maybe a Null?

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The very old Mando who reads the heart of fire and seems to be a close associate of Venku/Kad'ika and who hates disappointing people.

"He had a high boned, thin face and a wispy beard that was whiter than his hair, which still showed traces of sandy blonde."

Bard'ika, perhaps?

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Venku's armor.

"The palette ranged from blue, white, and black to gold, cream, gray, and red."

Vau and Skirata obviously donated bits of their armor. (Jaing has Mird and the three-sided knife.) Darman probably did. ("The forearm plates were my fathers.")

Any idea of who donated the rest of it?

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Sev's fate during the Battle of Kashyyyk.

In RC: True Colors he sounds almost wistful about what Omega and the Nulls have, while the rest of Delta doesn't seem to care.

Perhaps his "capture/death/dismemberment" over the comlink was a ruse, and he ran off to Mandalore with the rest of Skirata's bunch?

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Just a bit of speculation to tide me over until Feb. and LotF: Revelation comes out.

Any other ideas?