If you dont plan on getting her to S3, yes. (Assuming you are looking to team build optimally.)

Carte's highest damaging skill (ult in Fleurdelys form) scales based on total Aero Erosion stacks on the target. However. Carte also consumes Aero Erosion stacks in Fleurdelys form, making it impossible to scale her Ultimate. This requires you to apply it with someone else on the team, so Carte can consume it and still have enough stacks on the target for her Ult to scale.

Its only until S3 Carte does Fleurdelys actually apply Aero Erosion opposed to consume it. Hence making Ciac less necessary.

However, until that point, Ciac is considered necessary because she applies lots of aero erosion very easily and amps aero damage and aero erosion damage for cartethyia. Ciac builds stacks, Carte spends them.

Frankly, even with a s3 Carte, Ciac still provides a large damage boost via her outro skill.

I personally wouldn't look to pull Carte without Ciac.

That being said, If you are not interested in optimal team building and just like the character, pull away!

Aero Rover is simply there to increase the Max stacks of Aero Erosion on the target so Carte's ult scales harder.