I think that the court case is a boon. It has been brought in to make the serial more interesting and gripping.
Coz see bani can bear everything, she can take all sorts of "illzaam's on herself. But this extra marital affair is the only "illzaam" she cannot take coz she knows that if this is prooven to be true she will not get the money. So she will definately want to fight back.
And she will tell Tarun the truth about her a pushy and force him to fight back......and now i think she might just (if she has any brains left) tell Tarun her real intentiosn behind getting the divorce....and here will come in the whole Tarun helping JB get back together thing.
I think by the end of it jigs plan will again backfire on her and bani will get the divorce and money....and Tarun will become bani's friend.....he will also be the one to disclose the truth to Jai.
I think this is what the promos meant by saying that jigs will use jai is a pwan in her gameplan.....coz she is actually using jai's name to put the blame on bani.
chalo dekhte hai yeh court case kaisa chalta hai. all the best guys.