I'm not a Kyle Bush fan, but RCR has some fast race cars, they've proven that, and I think Kyle will only help make them faster.
Kurt Bush improved every team he raced for, and I think Kyle will do the same at RCR.
They can do some amazing things with body wrap now. I'll bet that they could make all the cars the same, body, nose and tail, and with the wrap they have now, trick the eye into seeing a Ford, Chevy or Toyota.
I was thinking along the lines of a seat, or a seat within a seat, with maybe some of the expanded metal that they use for crush panels in between. The seat and headrest would have some give in the event of a crash, but would otherwise be solid.
I think that part of the problem is that the nut IS tight and probably at the right torque, but the splines are on top of each other, instead of engaged. As soon as the car hits the ground, they settle in, and the nut is loose.
On the flip side, over at SHR, you have Harvick running decent, but he gets to compare setups with Briscoe, Custer and Almirola. I can't imagine that he gets much useful info there. Not like he did with Newman and Bush.