Both Hassan and Hussain didn't spend their lifetime making that money like Zulfi.They become billionaires by the age of 13 when they were living in Pakistan.Nor, Zulfi had a three time prime minister as his father.Remember what Nab prosecutor said that having properties on your son, daughter name is how corrupt practices are done in Pakistan.Neither did Zulfi lied about being owner of those properties.No way to compare both scenarios.
Can NAB simply ask him about money trail of his capital which he used to start that business?