Yeah, so I went through all of the Halo bloks blind packed minifigures at the nearby Target, looking for a Cortana figure. After many packs, I came across one where I simply could not tell what was in the package, because there was no weapon. Aggravated to the point of not thinking correctly, I bought it, thinking "No weapon in the package equals Cortana."
I cannot quite get the head to fit. I could simply hollow out the opening a little more with a craft knife, but I think I might just leave it how it is an display it as an object lesson. Hubris breeds Nemesis.