The only candidates not plinking the same notes over and over again currently are Katie, Ricky Martin and (oddly enough) Jenna. And of those Katie's story-arc might be over (Nick says that Katie does nothing - Katie does something - THE END), and Jenna's lack of screentime and that accent are holding her back from developing.
I know it can't be Susan Ma's amazing rollercoaster journey every series, and I do like more of the candidates on a personal level than usual, but some of the front-runners badly need a setback and some of the one note characters need some variety. I'm not sure how many more episodes of "Jade does some minor creative thing quite well, no1curr, she says one sentence" I can do.