I’ve said it on here before Sainz is a good driver, he is also strategic but he is not a Verstappen, Hamilton or Alonso at their prime.
He is at his prime and can win races and get results but it’s the ability to consistently drag results and score points out of not the best car on the grid that is the differentiator.
All teams, particularly the top ones, are looking for the next Verstappen, Hamilton, Alonso. RB have Verstappen and he could go on winning for years, they want to keep him happy and, unlike Lewis, Max doesn’t like having a team mate who will challenge him.