WI: Malik Shah I survives until at least 1096

Malik Shah I was the last Sultan of a fully 'united' Caliphate, and after his death in 1092 the Caliphate split among his sons leading to a disunited Islamic Empire. Then 3 years later the First Crusade began and yada-yada-yada the Christians 'win'.

But, WI Malik Shah I survives until a year after the Crusade began, how would this affect the first years of the Crusade and what happens after?
 
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