I can't imagine Arsene Wenger will put out a 'weakened' side v Brighton, it is till Arsenals best chance of winning a trophy and for a club of that class and magnitude their fans will be livid if they go out of the FA Cup at the second hurdle
For me I want to see their strongest team out, it's very rare for Brighton to see such quality sharing the same pitch, I for one will be pretty star struck to see the likes of Sanchez, Giroud and Cazorla on the same pitch as Calderon and Forster- Caskey. Good experience for the Brighton players...