Regarding any Coaltown-Citation comparisons:
Coaltown almost certainly got to levels as a 4-year-old that Citation never reached in his career....and even though Citation was defeated in 11 of his first 13 attempts as an older horse - he was coming back off of an injury.
Here's Coaltown as a 4-year-old. The horse he beat by 7 lengths last out was coming east after winning the Santa Anita Handicap. He won the Suburban Handicap after that thumping.
Coaltown opened up 15 lengths and went on to win that race by 12 lengths to go 8-for-8 - he carried two bowling balls more in weight than the 2nd and 3rd place finishers of that race. He slaughtered some excellent competition in his prime.
With Citation - you've got one of the two or three greatest 3yo seasons ever. Coaltown is more of a Gun Bow type. Both are in the Hall of Fame ... both truly belong in the Hall of Fame ... but their greatness has more to do with a string of incredible indivdual performances than any long sustained peroid of greatness.