system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar] Questions after seeing sequel. SPOIlERS

Firstly, In the second film we see Stephen Lang return but now he's blue because his memories were downloaded before he left for Pandora.

Wouldn't the same thing have been done for jakes brother seeing as how they spent billions on the avatars, maybe even as a necessary part of the creation process. So why would they need jake in the first place?

Secondly, since humanity has demonstrated the ability to genetically engineer alien hybrids capable of accepting a downloaded human brain it stands to reason that humanity should be able to engineer human clones capable of the same, why do we need the whale  brain goo to live forever if you can just download your brain to a new clone?
gpt
(For the Goo)--It could be because, with a download after death, 'you', still die and the download is just a perfect replica that goes on in your place, so 'you' still would actually end.

Hence wanting to live on forever.