I have to wonder if this courtship was set up to silence the growing speculation about whether any of the older daughters would ever get married. Jim Bob probably picked Jessa because she is "the pretty one", and set up a made for tv courtship. Then Jill met Derrick, which was not staged, a little unexpected, but genuine. Now maybe Jim Bob is scratching his head wondering how to get Jessa out of the courtship with no stain on her reputation. Just my own interpretation- YMMV.