I can only think of the rewards sunny is going to get when he brings all these people to safety....and how much he's going to hate being in the spotlight. LOL
Maybe with the passive defense against Mental attacks from the Mantle becoming soul bound to Sunny he can use the Sin of Solace now without going insane.
I'm getting the feeling that the next battle to come will be a defining battle for how the tide of war might change in Antarctica. when he makes it to the city I feel like he may come in contact with his "Master"