Holmes won the title in the 70s, and had some nice title defenses in the 70s. That falls in the vote, and in this topic. Only the 80s. Tyson did "everything he did" in the 80s. In the first fight of the dawn of the 90s, he lost...
This is why I think decades should be determined by debut year. How a fighters career fits into 0-9 shouldn't matter. Holmes is early 80s, Tysons late 80s. But age wise Holmes "belongs" to the 70s and Tyson "belongs" to the 90s.