Both Muffett and VanDerveer were born to coach where they each are currently successful, so I can't imagine a circumstance under which either of those two would take any other job offer.
I personally wouldn't be fond of the choice of Walz. Something about him sets off negative alarms for me. I worry about shenanigans with him.
I like Staley and think she has performed a miracle getting the former perennially bad South Carolina all the way to the top of the SEC in a relatively short time, along with doing an outstanding job recruiting new loyal fans. That said, even she falls short (so far) of being able to put together a strong offense that adequately takes advantage of the top-notch talent she has brought in.
Hard "no"s to Mitchell and Frese for my taste, even though both are big names that I think could be convinced to leave their current situations.
Out of all your possibles, I'd choose Mulkey. She has a well-known, healthy respect for Pat's legacy, and I think she'd fit in well in Knoxville.
I could be extremely happy with Gary Blair, or if Leon Barmore could be coaxed out of retirement, that would work for me, too.
I'm going back into this to say that even though I respect and admire the seasoned coaches I mentioned above, I suppose the ideal situation would be if there were a big-name younger coach out there. Someone with energy (like Staley) but with a creative mind.
There are those who would disagree strongly with me based on their lukewarm success with other programs, but I feel that both Jolly-Harper and Caldwell-Fargas have the potential to find FAR more success at Tennessee than anywhere else either of them has been. Let me explain.
At those other places, the recruiting basket for both of them was far less filled with tempting goodies than it would be for an exciting young coach at Tennessee. If Harper, a Tennessee native and beloved former Lady Vol with actual head coaching experience, were to take over, she'd have an easier time convincing young players to come to Tennessee to help her fulfill lots of peoples' dreams than she has ever had anywhere else.
Caldwell was well on her way to becoming a UCLA legend when she answered the call to come back South to be closer to family. Pat once commented that Nikki was the closest to being like her than anyone else she's ever coached with, and that was telling.
Given the money and the freedom to hire WELL, I don't think either Kelley or Nikki would be dumb enough to not hire a brilliant offense-minded assistant. I just don't.
So I could be happy with either of them because, again, recruiting to Tennessee would be an easier job for either of them than they've had elsewhere.