Ali had bad technique and defense, what he had was heart, courage, athleticism, a great chin, and he knew how to go against the rules of boxing in an effective way.
Ezzard Charles didn't have te best chin, and also could be sucked into brawls, I feel as if his skill made up for his slight shortcomings of ring generalship.
Sometimes during as well :yep "What's my name!" "What's my name!" - Ali to the hapless Ernie Terrell.