CP-0 was trying to avoid the chance of Luffy hitting awakening. They weren't the least bit concerned about Luffy beating Kaido. It was Luffy's awakening that they feared. Once again, if OKG would defeat Kaido, then there is literally 0 reason to have Luffy get awakened, period.
They were expressing worry about how the battle was progressing outside of expectations...
If Luffy beats Kaidou without awakening and continues to grow stronger it just increases the likelihood of eventual awakening...
Literally no reason to interfere if they thought Kaidou would
definitely kill Luffy by himself... Keep huffing copium, you seem to be ignoring all the chapters of Luffy looking better than Kaidou in their serious fight pre awakening. Creating some arbitrary zero chance for a Luffy victory is against the mindset of all characters involved.