I hope that one day we won't have to choose which of these three to let live and which to kill. At least, such a choice, in my opinion, is definitely not appropriate for a conventional 'good ending'. So far, as I see it, Seth's personality, his character and his true mental faculties are still not revealed, and indeed we don't know much about him at all when compared to Olivia or Kane. And so far, Seth evokes only pity and sympathy due to his illness and relative helplessness. Perhaps the right thing to do would be to let Veronica heal him and get him actively involved in Gambit already. The Gambit Queen at the Temple mentioned that not only Olivia and Kane are important to Gambit, but that Seth is also important, but what Seth is really important to Gambit (unless this "importance" was only dictated by maternal concern for the future of the handicapped child) I don't yet understand. Although I accept that you don't plan to make Seth a fully independent player of Gambit and he will remain either a toy for the sadistic women or a protected "brother" for Olivia. But since in this world you have created, the weak do not survive or are forced to grovel before the strong-willed, it may be time to decide his fate.
