The city of Chicago’s top lawyer Monday warned aldermen that the city risked losing a lawsuit for a lot more money had it not settled the claims brought by the estate of Bettie Jones for $16 million.Corporation Counsel Edward N. Siskel testified before the city council’s Finance Committee that the “tragedy” of Jones’ death could have led the jury to bring back a verdict “well in excess” of the settlement the committee unanimously approved following Siskel’s testimony.&ldquo …