User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-11512871-20130703190313/@comment-11512871-20130704023756

He is just a core character and I think that Rick should bring him back, Rick always finds ways to link one thing to another so it wouldn't be too hard to organize, but I just think the books would turn out better if he added a little bit to the story line. In, "the mark of Athena," when Percy and annabeth sneak out of bed on the, "Argo II," they recalled being in the animal van in, "the lightning thrift," they didnt even mention Grover once, even though he was a huge part in the book.