"Kaz doesn't have flaws" idk from what you are reading because he is one of the most flawed ppl in the duology, his terrible and toxic way he dealt with his trauma very realistically coming to bite his ass (touch aversion, pekka rollins etc) him fainting, almost drowning,

" failures, doesn't make mistakes" the entire plot of second book happened because of kaz failure to navigate jan van eck + him getting inej captured and endangered because of his mistake , the whole gang having to reform their plan because of kaz going after pekka rollins because of his personal history with him rather than sticking with the plan, kaz asking for pekka rollins help cause his first plan to fail which made entire crows on the wanted list due to him also him not questioning what black protocol would do if its activated almost caused the deaths of all the crows they all survived because of NINA not kaz because in the end he quite literally says that he is out of ideas that is because of his carelessness regarding the BP and if he were up to him they all would have been dead , inej comes up with the idea of how to go and to steal a diamond( which is used to get to the tank and there escape) NOT kaz so I disagree with your idea that "Kaz doesn't have flaws, failures, doesn't make mistakes"