Also, calling it now, Matt D gets the second 23XI ride. Denny likes him, sponsored him that time back when he was still with GoFas. He's experienced, doesn't tear up equipment, and his salary is going to be many times lower than free agent Brad would be for instance.
I don't see Harrison Burton getting there by way of JGR connection because starting next year the chassis's are a common part from one supplier. The dependence on the major teams from their satellites is going to become somewhat reduced, and I don't think MJ will want to be JGR-lite. He has a huge ego and deep pockets, he doesn't need to fall in line for Coach Gibbs.