Sometimes they are just wrong. They may be useful and then, for reasons not having to do with anything a client can control, outlive their usefulness. Sometimes, they are so wrong, there is no ability to go on with that one. If I did not have a lot of disposable income to play around with these people, I would have completely gotten rid of the first one. I am glad I could find a role where she could be useful, but the second one is much better.