They just need someone who can think with an open mind and use logic. Salk didn't start whining when Russell Wilson got the job, he doesn't revert to predictable, conventional opinions. I liked that he was a bit of a homer sometimes, but was also prepared to be critical when he needed to be.
And one other thing - his interviews with Pete Carroll were BY FAR the best. Nobody else gets close to interviewing Carroll one-on-one the way Salk did. He gets it. This is going to be a big loss.