[Danzig]

i doubt the streak would have happend had holy bull not suffered his injury. but that's racing.

i'd imagine there could be arguments made for many horses in the thirty year period. cigar was lucky enough to run in a period where there wasn't much top competition.
i think silver charm at his best would have beaten him. sunday silence would have taken him to school. at belmont, easy goer would beat him. that's off the top of my head, and ignoring the obvious such as seattle slew, the bid, etc.