What one person do you think would have had the biggest impact if they continued?

I'm watching Dirty 30 on the challenge Roku network and I started wondering to myself what would've happened if Camilla continued on the show after this season. Obviously, Camila is a terrible person and I'm not by any means saying I want her back on the show. However, I do think you have to acknowledge the pull and influence she had on the show at the time. Once she left, Cara basically became the female face of the show and I think a lot of people have opinions on how that's gone since then, but I think no matter how you feel about Cara you can't deny things would have still been different if Camila was there. Same thing with Tori's trajectory, if Camila was still there I don't know if Tori takes over as face of the show at this point because I don't think Cara would've been such a divise character that got put in a (necessary) timeout. I also think Camila was so drama filled that it would have been interesting to see if she was still even welcomed in this new challenge climate or if she would've gotten the Ashley M treatment where she was put in timeouts.

Another person that jumps to mind is Landon, he's viewed by a lot of people as one of best but he's got such a small sample size. I wonder if he would've stuck around if he would've got more wins and in doing so who else would've got less wins.

Who else left huge gaps for the cast to fill by not coming back to whether it was their choice or not?