At the time Randy Bass (an Oklahoma-born baseball player and an exceptional hitter) was on the Hanshin team. It was widely thought that his playing was what led the team to win.
When the Hanshin Tigers win a game their fans tend to jump into the Dotonburi. It's the happy thing to do. On this auspicious night someone must have recognized that Colonel Sanders looked a whole lot like Randy Bass and thus the statue's fate was sealed.
Here is the Colonel.
Here is Randy Bass.
Edited to add:
They found his bottom half and a hand! The city of Osaka is elated. Their baseball team -- now realizing the curse is broken and they have to start winning games -- not so happy.