Eh, part of it's "Nara's da best and can't make mistakes" part of it's dirty meta-level reasoning about the QM's being unwilling to kill us for letting the genius take the reins. I'm also more taking it as "Nara is Nara, therefore no Abysmal Failure" than concluding it from the "you won't be blamed".
E: As an example, if this was Neji insisting on being in command and the choice was between letting him and taking charge ourselves, I wouldn't be going "oh well the prompt says we won't be blamed, so things can only go well if we let Neji lead!"