I agree, I would say Trent is the only top forty artist in the competition. Tent is a very good singer, but like you I just don't care for his voice.
La'Porsha, imo has a career in one of two areas, Blues or Broadway. However, I hadn't considered as one of the other posters here did, Gospel; so she has three options. I don't see selling her much in the way of pop CD's. She could get lucky and sing the right song, maybe have one or two hits.
For me, I will be so happy to never look upon her image again, and to never hear again is just a plus.