Mike had 3 stages to his career. When he wasnt under King, when he was with King and when he left prison.

When Mike wasnt under King he was the nearest any heavy has looked at unbeatable. Even though Marciano retired undefeated, he got dropped and struggled with an old light heavy, he didnt have long left.

Alot of the media weresaying that Mike is invincible and is close to taking Alis greatest crown. Its only since King spoilt him that people are completely disregarding what he did with Rooney as his trainer.

Post prison Mike was just getting paid and was being used to make money.