Rn, if Gustave does go, I think the most likely boot order if the game is left to its own momentum is:
7: Oracle
6: Margot
5: Richie or Madame
4: Richie or Madame (or Suzy if one of them wins Immunity)
F3: Duke, Royal, Suzy (or Richie or Madame if one of them won Immunity)
So given that, maybe Suzy is making the right call, since I do see her coming in as the favorite against Royal and Duke, though FTC absolutely would be critical there.
But if Madame, Margot and Richie can hold it together for a little bit longer, then they could force one of themselves to be at the end.
Also Royal should really be stabbing them probably but I doubt he will.