On mental toughness (and ruthlessness), I wouldn't rate Matt, Lee, Kristy as having enough in the tank. Kirsty's gone wobbly once already, despite some good gameplay and likeable traits. On smarts, not Sam or Kylie. On social, not Sue, possibly.
So, the existing triad plus Ms. Invisible. Brooke might have a good shot. Haven't seen her (or Flick) under much pressure, although Fluck surprisingly struck me once, as rolling over too easily. Brooke might prove a tough, smart little nut yet. Her biggest challenge may be adaptability, and not rubbing people the wrong way with her 90 % safe attitude. (Good thing it's not about viewer votes lol).
Considering the jury, Brooke, El, JL arguably 'appear' to have had fewer conflicts (really not sure about Flick) because they haven't been at the coalface much, until now. An underdog in the finals might get the majority jury vote, if they can make it.
On that note, El! The cleanest slate, smartest of those left? and she could get jury votes from both sides lol
But the thing is, El hasn't had much of an edit, so back to Brooke! LOL