Read my post on the bottom of page 21 in the Comprehensive Hemalurgy Thread. I am well aware of the discussion's about Hemalurgy "giving" Allomancy, and I believe that gaining Allomancy from your sacrifice would just be an added perk if the sacrifice happened to have Allomantic blood which seeped into you.
It's almost like the Lord Ruler burning his Feruchemical attributes through Allomancy. He got his special powers because he Allomantically burned a special source of metal. In this case, Vin obtained the abilities of a Mistborn by Hemalurgically using a special source of blood. By tapping into her sister's Allomantic blood in her body via Hemalurgy, she gains access to the Mistborn abilities. It would explain why Inquisitors can use all the different metals, because they have a wide variety of misting/Mistborn sacrifices to use when impaling themselves for Hemalurgy.
So basically, gaining the Allomantic (or Feruchemical?) abilities through Hemalurgy is just a perk in addition to gaining Hemalurgy, and it depends on who's blood you have flowing through you.
Almost forgot, about the Bronze/ear issue, it's true we came to a general consensus, but that proves very little. It could go both ways, but I have to agree it's probably the bronze doing it. (Though then why would the prologue's bronze spike go through the heart? Maybe all piercings have to go through the heart. Of course that would void the organ/power deal, which I liked a little.)