For me actually it's OK.. Being a professional dancer he should be confidance of himself, And if Kapil got saved,and Rakhi, Both of their dances were just average. So he must be very confident about his talent. And There is no such rule that person who is in the elimination round cannot dance. Since he is not pressurized by the elimination round he concentrate on other acts as well.I remember Kapil also participated in the group act(Mom's sp) on the same day he was in the elimination round.Please correct me if I am wrong.
Since the next week judges challenge is Contemporary, I think boys took a very smart decision by selecting Mukthi for elimination.
But I am sure she will also do the same as siddesh, since she is a very good dancer and it is not a impossible thing to concentrate on more than one act. May be the show is scripted , But I don't see any bad or weird feeling about siddesh being part of more than one act.