Board Thread:Theories and Speculation/@comment-31848378-20170429190021/@comment-25122992-20170429191539

It wasn't a grave, it was a memorial of sorts made by Naruto, since Jiraya couldn't have an actual grave because of the reason already mentioned by Vladosaurus. Also, @Arbaaz009, I don't get why you had no idea about it, despite Kabuto himself voicing his wish to reanimate Jiraya and saying about the said reason why he hadn't been able to do so.