Alright, No one is probably interested, but I felt I should mention, after doing a quick Tanya analysis, being an NPC, here's how she contributed to the story this time around (in mass detail):
-Tanya and Rain are co-op general ambassadors of the Rebellion army
-Tanya apparently freed Mileena from Kotal's captivity after she was overthrown (according to Kotal)
-Tanya saved Kano's life, and KO'd kotal for a few seconds.
-Tanya and Kotal apparently have troubled history from the dialogue they switched together in chapter 2.
-Tanya and Rain were charged with protecting the amulet in the rebel camp.
-Tanya led the tarkatan rebellion attack in Outworld at Mileena's command.
-Tanya defeated Cassie Cage
-Tanya was about to be murdered along with Rain, but Cassie told D'vorah to let her and rain live.
That's about it for her. She just vanished after cassie let her and rain live.
yeah i see tanya and rain being playable next game if the next story invoves kitana want to take back ediena form outword and merge it with neathrealm