Ngannou should know that AJ is strong and has heavy punches that can make someone collapse after been hit by one of the punches. I think that because Ngannou won Tyson Fury that was why he felt that the fight between him and AJ would be an easy one, but he got defeated so easily and so quick like a baby.
I watched the replay of the fight, and this fight makes it look like we were played by Tyson Fury when he fought Ngannou, AJ makes Ngannou looks like a novice boxer. It was very easy for him (AJ) to land heavy punches breaking through Nganou's defenses. If anyone noticed, that last punch that ended the fight looks like a walk in the park where AJ just goes forward and gives that finishing blow without Ngannou having the capability to block or resist the punch.
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I think Tyson Fury does not take Ngannou seriously and possibly Fury is not serious during his fight against him. It is also possible the fight against Fury is just a promotional fight in order to establish Ngannou's possible great boxing career but I think AJ just ended that plan... I do not think that a rematch is needed. We clearly see that Ngannou just can't keep up with AJ's punching power.