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The whole thing with Jelacic was a battle for the control over Croatia. The bán was subordinated to the Hungarian king (not the Austrian emperor), but due to the revolution the real power went to the Hungarian parliament and government, it was a move toward a constitutional monarchy. Just before the government could have formed, the Court made sure to appoint a bán who had no revolutionary ideas, who was a loyal imperial officer in the imperial military (that Jelacic had civilian administrative practice too, and was known and like locally it really was a boon, and made him an ideal candidate for the purpose, he was also a pragmatist - it seems to me - so he could use any tools without prejudice). I think they basically just waltzed over to Ferdinand and said:
> your majesty one of the high offices in your Hungarian kingdom is empty for a while now, it is really a shame, and it would serve the kingdom well to appoint someone, here is this baron from a good house, he is a loyal subject of yours, serving you for decades, he will be a swell choice
> ok here's my signature
While de jure he should have get his orders from the Hungarian government, it was busy setting up the institutions, the finance, and the military to take the control in its hands, there was the matter of incorporating Erdély/Transylvania and the abolishment of serfdom. At that point even the Serbian riffraff in the Southern Ends meant trouble, they had no power to enforce anything outside Hungary proper. So de facto Jelacic was independent, and while the Hungarian government managed to influence the king to remove him in name, they could only hope he would follow the ways they deemed legal. But since he never took the oath of the bán for the Hungarian govt, and he was a military commander in the region as the emperor's officer, he could stay in power if he wanted, legally. So it was kinda a loophole of overlapping offices. This situation was handed over to him by the Court, and the reactionaries there encouraged him, to hold out, and later, to act.