Koji was also 38 years old and really served more as a high leverage guy. He wasn’t a well kept secret. He just didn’t pitch most of his career in roles that earned saves.
And on this date in 2013, the Sox “top o the line” closers were Andy Bailey and Joel Hanrahan. If you accept Koji as the closer, gone. But also accept he was given a chance. And by selling the whole “well kept secret” justification, it does take away from the argument that it’s some sort of special skill set….