The WCG All-Bears Post-Ditka cornerback (click here for the series introduction)
Players in contention: Jerry Azumah (1999-2005), Walt Harris (1996-2001), Tim Jennings (2010-2014), R. W. McQuarters (2000-2004), Tracy Porter (2015-2016), Nathan Vasher (2004-2009), Charles Tillman (2003-2014), Donnell Woolford (1993-1996)
Charles Tillman is the best cornerback in the post-Ditka era.
Charles Tillman is the best cornerback in Bears history.
Charles Tillman is the best defensive back in Bears history.
I am certain of the first two statements, and pretty confident that the third is true, with apologies to Mike Brown, Gary Fencik, Richie Petitbon, Doug Plank, and others.