Board Thread:Questions and Answers/@comment-138.130.106.201-20140801110937/@comment-3250527-20140801183040

The "revival scene"in the anime was the anime's dramatization at play. The said Divine Stone of Returning Soul" was already used, as Kirito told Klein to use it on the next person he (Klein) sees die.

Plus, it didn't explain why Asuna was spared.