Humayun has difficulty retaining power. He has various family rivalries to contend with, and eventually he is dethroned by the Pashtun Suri dynasty. He goes to the Safavids and with their help is able to retake control, but then trips on stairs and dies, and then his son Akbar comes to power. Now, Akbar is perhaps most famous of all of the Mughal rulers. As you can see, he's able to rule over India for some time. As just mentioned, Humayun essentially had to reconquer, retake the throne, and his hold on power was relatively weak, but now Akbar is able to expand the territory that you see in this light purple mauve color. He's able to increase the central authority, and perhaps most importantly, he tries to unify India culturally.