Polasek was an OC at an FCS school for three years. I'm not knocking him. I like him. I just think he and BF's qualifications are similar, and BF knowns the landscape here. More importantly, he's his father's son.
I've felt from the jump when I endorsed BF for the opening that he's the one guy that might be able to add some innovation to his dad's pretty strict foundational beliefs on offense. KF isn't going anywhere anytime soon, so if we want some progressiveness on offense, BF is the best option, IMO. And, I think he knows the game from my conversations with him.
KOK can be a good mentor for BF and help him with the transition. He's being paid like an OC so I think he'll have a lot of input without the scrutiny. It's a good setup for him. I wouldn't be surprised to see him as the eye in the sky (press box) this season.
This really is the final chapter in KF's legacy. If BF is successful, everyone is happy. BF likely gets a chance to succeed his father.
If things go sideways, KF will shoulder the responsibility and his legacy will tarnished. What's follows for the program is anyone's guess.