Dr. Woodard sure knew how to manipulate Sarah - better than anybody before him has ever done. I was a little surprised that she gave in when he said that David might be locked up. She was able to find Maggie when Maggie was locked up, so she should be able to find David if he's locked up.
I understand Vicky's concern for David and her reluctance to leave him, but given the way David continually has problems of some sort or other, if I were she I wouldn't make getting married contingent on David being OK. The thing to do would be to bring in a replacement now while Vicky's still there, and give her a month or so to settle in, and to see if David would take to her.