Khusrau Shah hatched a conspiracy against Mubarak Shah. Khusrau Khan was one of the favorite of Mubarak Shah. Khusrau Shah got him murdered in 1320 and himself ascended the throne.
The major objective of Ghori to attack India was to expand his empire and satisfy his imperialistic ambitions. The expansion of Islam and his ambition to glorify his name through his military exploits could be said to be his secondary aims. Similarly, loot and plunder may also be secondary aims because that was norm in those days to acquire Gold and wealth from defeated rulers.
Iitutmish , the Sultan of Delhi, was contemporary of Mongol leader Chengiz Khan. In 1221 A.D., there was a danger of expected attack of Chengiz khan on Delhi.