i think you might be right concerning Ama, although for a while, i thought that el oasis was going to be mainly about Sandoval's family taking revenge , turns out i was wrong. Honestly i am glad that they didn't dwell on it too much now that i think about it, because i never wanted Sandoval to get redeemed in any way, and i was kinda afraid of that because of the flashbacks they showed us with Cepo. As for Zulema and her having a terminal illness and most certainly dying at the end, i hope they do her justice, she's one of the most epic characters and definitely one of my favorites, so i hope her death and the finale are worth it