Assume they had to nominate tonight say.

Jack and Joel probably.

Jack because he took the money and is probably already a winner in their eyes.

Joel because of his refusal to take part in the sam eviction,

I'd guess at:

Chloe: Joel and Nick
Cristian: Jack and Nick
Danny: Joel and Nick
Jack: Joel and Nick
Joel: Danny and Jack
Nick: Chloe and Danny

Nick 4
Joel 3
Danny 2
Jack 2
Chloe 1
Cristian 0

Good question, the originals have never had to nominate each other, making nominations very predictable this series.

Joel and Nick would probably be the easiest targets.