Louis had quicker footwork, IQ, and far greater hand speed and accuracy than one trick pony Wilder, and it still took him 13 to find Conn's sweet spot. Conn was fantastic and would take over the Bronze Bum and lead him around like a circus animal until he gasses by the 6th,
In fairness Deontay did have appreciable cardio when he didn’t jump up to 230 against Fury in their last two fights. He’s proven he can end a fight late, or remain a threat in the later rounds like Ortiz 1 and Fury 1
Ortiz and Fury never applied consistent pressure, and both were slower and more prone to exhaustion. Nonetheless he wouldn't last long enough for stamina to be an issue,