User blog comment:Hermione Chase/"The Blood of Olympus" Expectations/@comment-24404080-20140304192821/@comment-3146930-20140304212123

The thing is we don't know that for sure. Luke mentions before he dies that he might try for rebirth, but Annabeth tells him he always tries too hard so maybe he didn't actually try for rebirth. The only one we know for sure that was reborn is Bianca.