My, how a plot can thicken in a hurry! As readers of this column know, it didn't take us long to hear from Alex Tiknius, the ardent Chicago Cubs fan who identified himself as the dejected young man in a new Nuveen Investments billboard ad (June 27). Tiknius is seen standing alone in the Wrigley Field bleachers after a Cubs playoff loss to the Arizona Diamondbacks last year. The Nuveen Investments billboard campaign is now up at Wrigley Field.