1
It's funny how greatness is tied to so many things OTHER than talent.
Bedard, for instance. He could continue to be injured for the next 3-4-5 years, and be a minor footnote in history, with one excellent season (2007) for his career.
Then again, he could be mostly injury-free from here until he's 38, win some postseason and world series games, and be one of the best pitchers in baseball for a number of years.
Bad defense, a bad fit with the park, a sour clubhouse, poor coaching, lack of discipline, substance abuse, poor choice in friends and acquaintances... There are a million things out there to derail a player from being great.