I always called MK as an illegitimate dad, when the twist was revealed.
Ideally, a child should not be called illegitimate, a parent should be. Because a child is not responsible for his existence the parents are.
As much as I hate Gangu, I will always call MK as his illegitimate dad. Not the other way round.
Now MK is dead, so there is no defendant party if Goldie wanna file a case. He can still figure out something in the court of law. But that will not change RK's status.
Because MK's legally wedded wife was Radha, and he himself accepted RK to be his son in the society. Now, that he is dead, no one question RK's paternity. If he was alive, things might have been different.
Furthermore, Meera was missing and actually, has lost her mental balance. This is a reasonable ground for dissolution of marriage, if it existed. But how will Meera prove her wedding, especially when MK is not there to defend himself.
And, whatever RK is because of his own grit n hard work. Not because he is a ''Kundra'. Everything he has is his own hard earned money. All respect he gets is as 'superstar RK', not as MK's son. He is the one who keeps glorifying his father.
So, only Najayaz is MK, not RK nor that Gangu!