The great minister of child welfare has already made it clear that she doesnt want to hear anything against a slain child, which leaves CBI fully aware of the fact that even thought talwar may be the main culprit they can not prove so because they can not point out the motive as to why a father killed her daughter, no one is moron enough to believe that in a 2X2 house like jalvayu vihar people can kill half of the residents with the other half not even knowing what happened. They are trying to save talwar and that is because of the direct pressure from this union minister, I mean how can a minister speak about a case when the investigations are going on? If the investigating agencies found out something about the girl or the father they have to use it in the court and obviously it will leak to the press. This new twist is simply to placate the ministers stand and let talwar go scott free.