I mean, if I could talk to those judges I would ask them if the point is to eliminate people based upon the worst design that episode, or if they consider prior work and attempt to send home the person who has done most poorly overall. i wonder what kind of an answer I would get?
They would tell you that they judge what they see on the runway that night. They do not take their body of work into consideration; those are the rules and format. This is an entertainment show, not a serious search to find the best designer. They all get exposure and some who don't win go on to have lucrative careers. We only hear about the ones who are fortunate enough to have a celebrity wear a dress of theirs. Uli has a booming business in Miami, to name one. Chris designs costumes, which is his love anyway. He got the exposure he needed to do well.