User blog comment:Flyingjinko/My Mortal Kombat 10 Story/@comment-5394850-20120813215104/@comment-5345666-20120814024233

Thanks for the feedback! For the repopulation part, if you are referring to the start of MK10, it was never really mentioned that Kahn killed off 75% population. Although the damage caused by him was extensive, I doubt it was something Earthrealm couldn't recover from, like in the original timeline. The same goes if you are referring to the end of the story.

Shang Tsung got resurrected when Liu Kang wished for his friends to be given back their lives by the elder gods which included Sindel. Since hers and Shang's soul were fused as one in MK9, they got resurrected back as their two separate selves.