If Sherem's experience with the spirit were expiatory, why does he die? If he has an experience comparable to Paul and Alma the Younger, why does not Sherem become a preacher of the truth? Certainly both Paul and Alma the Younger had sins that approached Sherem's.
Ultimately we do not know the answer to this question, but the ability of the Lord to redeem Paul and Alma the Younger is further support for the suggestion that this final experience of Sherem's was part of his redemptive process. The Lord did not need Sherem in the same way that he needed Paul and Alma the Younger.