I mean that I think that Lyon is the only attorney who is in it for the right reasons, thus she will stay in it for the right reasons.
If the others are still around, it will be just to get their face on TV, but will not have any major role (i.e. F. Lee Bailey in Simpson case).
Do you mean Lyons is the only one has the "passion" to stay? Because of her belief that this should not end in another death penalty verdict? (Which I think so too, but should not have opened that can of worms.) She is not there for the free publicity, but for a cause?