What the point of RB, or any constructor that's no chance of either title, having a designated no1?
You only commit to that if you're the best team under threat by the second best team, or you're the second best team and wanting to improve the leading driver's chance at a title. All RB would be doing is denying themselves the opportunity of a win.
That's what made Ferrari shit in the early 2000s. People actually get and accept team orders. But when it's a 1/3 of the way into the season, they're a mile in front, and they get Barrichello to slow down a 1/2 lap to give Schumacher an extra 4 point? It's just blatant disregard for what is reasonable.
Not that they wanted to win the 99 title with Irvine. But Irvine gave up points in the first half that year, which ultimately cost him the 99 title.