His books worth a read ,he talks about why he beat Ali and all the things he saw wrong that Muhammad did and can lend a bit of insight into what we are seeing and why he did what he did in the ring.
I give De La Hoya a vote. There was something beautiful about the upwards angled hooks he would throw...half uppercut half hook. I was a fan of those.
Three legends break down their left hooks: https://www.boxingforum24.com/threads/three-legends-break-down-their-left-hooks.203282/
Seconded. Tim Witherspoon mentions that's how Frazier told him he ought to throw the hook. Load the left leg and then launch.