What does someone just picking that up know about Jason coming out of the Lazarus Pit. I've been reading for years, and I barely remembered that part of his reincarnation.
Why Jason Todd, when the easier way would be to invent a new Baddie. Jason's history is complicated. Someone saying 'You aren't going far enough, Batman-who-I-don't-know' is less so.
Weaving in all this old comics trivia is both re-writing canon *and* making all of this less accessible to someone just buying the book.