Spider for sure.
We know Savathun saw that Zavala was weakening in resolve when she was spying through Shaxx's trophy Ahamkara skull, she might kill or corrupt Zavala.
Shaxx is either too steadfast or hardheaded as he sings Savathun's song but made it into a song about the Moon being made of cheese.
Saladin is old and I think they might kill him off.