This was highly controversial and criticized, but ultimately accepted by the families of the free concubines, who thereby had a higher chance of getting their daughters to become consorts of the Timurid rulers.
[1] Most of the women of the Timurid dynasty, wives as well as concubines, are only fragmentary known, and Khadija Begi Agha are one of few awknowledged to have had any political influence.
He appear to have done this because of personal attraction or emotional infatuation, since it was not the tradition for a Timurid ruler to take his predecessors concubines, nor did she come from an influential family that could provide any political advantage.
[1] She created a network of contacts within the Timurid court as well as with the literary elite to benefit her son Muzaffar Husayn Mirza in his ambitions to succeed his father.
Muhammad Hayder Dughlat referred to her as "the instigator of all mischief", and claimed that when prince Jahangir Mirza Babur became ill after having consumed vine in Herat, "it was communly rumoured that Khadija Begi Agha was up to her old tricks and had poisoned his wine".