@farmerman,
I just took an online refresher course on Norton and his contempo heavyweight rivals and fights. Ali afterward admitted in that fight (their first) to being tired and slow and initially be uninformed and underestimating Norton's skill and
dangerosity.
In the second fight, Ali (to himself) knew better to underestimate Norton. I just think he was not able to prepare conditioning-wise like he did in his early years. Too many distractions. Whereas Norton, even after his fighting years ended, still looked like Greek sculpture.
See the link below..for one of the greatest of all time displays of heavyweight boxing (Round #15 Holmes-Norton)