If those two don't work out, I'd put the search firm to work looking at P6 assistants before settling that any of the remaining 4 are the best choice. But with a gun to my head, Miller (with a firm understanding that his name doesn't get him special treatment if he fails), Kelsey (with a short leash...cut bait if he's not making major headway), Amaker (low ceiling, but known floor) and then a big gap to Odom. Odom even being on the list just seems like a favor to pops. He's, by far, the least qualified in experience and results.
I'm sorry, but this P6 assistant search makes zero sense. You'd rather have a P6 assistant than Kelsey who was a P6 assistant and has head coaching experience or Odom who has P6 assistant experience and head coaching experience. I just don't get this at all. Basically you are saying that if Kelsey had just stayed with Mack all these years he'd be a more viable candidate than he is now having HC experience under his belt? That's just silly.