Why bother with the high profile kidnapping in the first place? They go to the trouble of trying to frame a radical group that has been defunct for 25 years, kidnap an old woman and try to kill Monk. They should have simply broken into Nana's house and stolen the chair. There would have been just as good a chance that it would never have been missed and their crime would have been significantly less in the eyes of the law. As antique dealers, they could even have replaced it with a look-alike and it might never have been missed.