why can't zee cast rubi and avi in bhagaon wali

it will be nice to see avi and rubi again if zee decides them to cast in their new show bhagaon wali but I think this time its up to avi and rubi that they accept the offer or not becoz if they are casted then they have to play the same role all over again .so all blame can't be put to zee if they don't cast them.avi said he wan't to do something different now may be he would not accept the offer same for rubi also