Nothing ric has done up till now shows that he should be the one to replace perez if perez is removed. Infact from the red bull family tsunoda appears to be best placed. Though the only realistic options seems to be from outside the red bull stable
Not this season. Marko himself said nothing is 100% shure in F1 (as we all know) when asked about Perez driving for RB in 2024. They will not hesitate to pay him out and replace him. Perez is underperforming for a while now, that car is capable of podium finishes every single weekend.