He blew his wad early which lead to his punches being slower and more predictable, leading to Jack making easier reads and taking over the fight.
The moment his speed vanished you could see how basic he is technically.
I think the potential is definitely there if he adds more offense to his repertoire and also learns to pace himself and not fall in love with this "punches harder than Ngannou" narrative.
But lets be honest Jack also Homer'd his way a bit through this fight, just eating every head and bodyshot and pushing forward, that tends to drain the motivation and gastank of almost any fighter.