Who's Going to Die in The Walking Dead Season Finale?

Seeing as Sasha and Rosita have committed themselves to killing Negan at all costs, things aren't looking good. Whether Negan catches them himself or the other Saviors get to them first, we're not seeing too many options for escape. Why Sasha over Rosita? She's going to be the one taking the shot, so there's a strong chance Negan could want her dead most of all.