Emily I think Gemma was enjoying her freedom just in general. But also she might have done it for tactical reasons. Remember she wants revenge as much, if not more than anyone else. So she doesn’t want her part of the overall picture to distract from the larger end-game.
Opie isn’t gonna kill Stahl, well he might, but I think Jax will.
I thought it was pretty realistic that Tara was unable to kill him. Half-Sack’s death was very noble, and a great end for that character, so very sad.