^ I myself'd rather Ahnuld step in as an old buddy of Quaritch's, but whatcha gonna do.
while they can remotely slave a specifically engineered hybrid body to a human brain, it's pretty clear that they can't permanently map memories and personality from one brain to another.
Why is that clear? Because they didn't have a backup of Jake's brother's brain to employ? Maybe it takes a long time to make the map, and Jake's brother wouldn't consent to the procedure. It could also be illegal back on Earth, The 6th Day style, so their hypothetical copy of Quaritch could be highly secret and unique.