Caporegime
The latter option of Sainz to RBR would be interesting. Feels unlikely but as a driver from their youth program, it’s only fair to say he’s earned a shot.
If Horner isn't talking to Sainz and trying to tempt him into that seat I'll eat my hat, but I don't see Sainz wanting it. He was crushed by Max in his first season in F1, and going to be the B driver in that team doesn't seem like an enticing option. Sure, it'd keep him in one of the top teams - probably the only one available to him - but it'd mean being the whipping boy instead of the lead.
I wonder whether he looks at McLaren's improvement and thinks he made a serious mistake.