Do you remember when Nirvana's Smeel's like Teen Spirit came out? It changed the music scene completely. For a decade we listened to all those hair bands, and we liked them. we defended them. Then Nirvana and all of a sudden we couldn't believe we ever listened to that drek.
That's Jose Canseco. He introduced weightlifting and steroids to baseball, wrote a book, testified before congress, and made punchlines of of Palmeiro, Sosa, Bonds and McGwire. He single handedly brought about the elimination of steroids to the game, a decade and a half after introducing them. If a player, by himself, changes the future, the present, the past of the game, he's a Hall of Famer.