Noa showing he's much more perceptive--and introspective--than his introduction would lead one to believe is a nice, if predictable, turn of events. Everything else about the series to this point made it pretty clear he wasn't going to be some scumbag, because that seems to be reserved entirely for the out-and-out antagonistic figures. It was simply a question of when, not if.
Him being fully aware that he's nothing without his friends & comrades is good, though. He comes off as so off-putting in how he interacts with others that, coupled with how much those around him kinda hype him up, it wouldn't be completely out-of-pocket to think he'd have a chip on his shoulder. So to confide in Kachua about how he's upset about the Executioner, because it takes away from the others' achievements when he wants their party to get the recognition he knows they all deserve for more than just his own efforts, is commendable.
Yes, he does need to be a bit more aware of how he comes off to others, sure. But it's good to see that the newly introduced characters/rivals/friends for Kachua continue to possess actual depth to them.