This is a good question, and shows why Haye/Bellew is such a mismatch on paper.
Bellew/Maccarinelli in their primes has to be CW, and that has to be Enzo hands down.
Enzo was a worthy champion who defended his title on multiple occasions against top 10 fighters in the division.
Bellew is a made up champion, unproven at the weight and defended against a part time commentator.