2 Survivor 46 contestants who should be safe tonight
No one can be considered safe on Yanu. There is a good chance they will lose again, and it's anyone's guess as to what might happen then.
If anyone seems secure on Nami, at this juncture, it's Tevin. He's well-liked by everyone but Venus, he's fun-loving, and he keeps the mood light in camp. He's also performed pretty well in challenges. If Nami were to lose the immunity challenge, there is no way Venus could muster enough votes to oust him from the game.
On Siga, the situation is a bit different because everyone seems to get along fairly well and they haven't had to play the game much yet. Ben appears to be the glue of the tribe, but he also seems to be aware of that, and that can be a dangerous mindset.
Even if Siga were to go to tribal council, it doesn't appear likely at all that Ben wouldn't be the choice to go home. He's probably safe as long as the tribes remain in their current versions.