Oh boy, Luke, let me tell you, House of Hades really put Percy through the ringer when it comes to corruption oops.

yeah! maybe Luke decides to follow the questers with his own personal reasons and not at all because Percy disappeared or anything, and Piper could have gotten separated from the boys and decided to go along with the Boy Who Must Not Be Named (you've got a bad rep, Luke). It'd be fun to play Piper from the early stuff when she's still figuring out her powers and what it means to be a demigod and shit (and also wondering if Luke is included in that whole "hand over the demigods to the giants and your dad won't get squished" deal)