Mehta states that Minhaj's statement that the child was "brought up and educated as a prince" indirectly implies that the child was not a prince by birth. Plus, Minhaj states that in 1225 CE, Sultan Nasiruddin's mother married an office named Qutlugh Khan. According to Nizami and Mehta, it is unlikely that a widow of Iltutmish married a petty noble: it is more likely that Sultan Nasiruddin's mother was a widow of Iltutmish's son Nasiruddin.
Mehta and Nizami suggest that Minhaj's statement about the child being raised as a prince is contradictory to the fact that Sultan Nasiruddin's mother married an official named Qutlugh Khan, which makes it unlikely she was a widow of Iltutmish's son.