PNB scam dented Modi government's image of being tough on corruption?

The Punjab National Bank scam with diamond jeweller Nirav Modi as the kingpin has pushed the Narendra Modi government on the defensive and given the opposition a stick to beat the government with.

Must the Modi govt bring back Nirav Nodi, Vijay Mallya, Lalit Modi and the likes if they have to limit the damage before 2019 general elections?