IIRC in the early phase of the war, Diponegoro almost effectively obliterated Dutch war capability in Java shortly before reinforcements from other islands arrived. What if, for some reason the reinforcement fleet sank completely or partially on their way to Java, giving Diponegoro breathing room to consolidate his domains and building conventional warring capability before the inevitable Dutch full scale invasion to subdue him ? Will we see a resurrected united Mataram in south-central Java under him ? How will it relate with DEI ? As a Hyderabad equivalent ? And how will this alter Indonesian history beyond ?