Posted:
Since the CVs have started the original synopsis that zoya accidentally gets married to ayaan and all that. IMO ayaan because of humeira (read her illness) divorces zoya in anger before nighat's wedding and then realises his mistake (by that time zoya will be at KV) and comes back to asad to ask for zoya until nighat's marriage and then asad will refuse, which will trigger the brothers clash.
i may be completely wrong but this is the only logical thing i could think of as far as asad getting back zoya or brothers clash is concerned.