Again, why would Icheb brag to Chakotay about keeping his secret if Chakotay died immediately after telling him that. He didn't have any use for the cider (as a dead guy) so why would he care about what was done with it?
Because he has a sense of humour?
Congratulations! You've just found THE excuse for all the errors, contradictions, oversights of the whole franchise.
Question: Why doesn't Kirk remember that he used to have a brother?
Answer: Because he has a sense of humor?
She should instead have been worried that he was back on board at all! He was supposed to be on a planet without technology, remember? How did he manage to get out of there without external help? How many of them there are is much less critical than how they did get there in the first place.
From a tactical point of view how many opponents are on board is the more pressing issue from Ceska's POV. In any event the point is that she is concerned and asking questions.
From a tactical point of view, it's more important to know who helped them to get out of the planet and how and if there are any ships in the vicinity and with what fire power. I don't think she believes that Chakotay and his confederates just appeared on the ship by miracle, do you?
You sound like you're only interested in finding fault for it's own sake.
I could return the compliment and say that you are only interested in finding excuses for everything and not in having a rational discussion, but I don't think I will.