I'm aware of who signs his paychecks. Point me to where I said he was going to be leaving for Dario's ride right now. I simply said I'd like to see him in one the best 4 rides in the paddock.
However, you're incredibly niave if you think any driver wouldn't leave their current employer for something they thought would give them a better opportunity to win more races or titles, regardless of who makes the car or the engine.