As soon as it was decided sam wont be the villian the character became forced, I mean if he was the bad guy it made sense nathan to not talk about his brother with whom he had a shady past, But in the changed version he shared a good relationship, how can he not tell elena abt his brother?? in the end nates motivation for helping sam felt weak as i didnt care for his character at all.. And Nadine its better not to talk about it. just would like to say she felt forced even in lost legacy.
Because the memory of his brother, who he believes is dead, is too painful for him to want to talk about? This is pretty apparent from UC4.
And he helps his brother out of guilt for what happened to him, the problem Sam is supposedly in, and the boredom of not being out adventuring.
I think Nadine is a bit forced in Lost Legacy, but that could just be because her South African accent is not that great. Its a bit jarring at times.
those are implied plots, but those were not conveyed convincingly enough for anyone to care about. and I dont have to tell you that trio have been in far more painful scenario not to share such details, Nate had almost lost elena in Lost legacy.. also if u remember third had a small plot that his real name is not drake.. and even in flashback in third there was no hint that he had a brother! remember he lost sam when he was much older..
Leaving his brother to die is far bigger plot line and valid excuse for drake to hide it from elena.. then he died during a heist.. that is something u bring up in a conversion just to let your partner know.. Also the reason sam is not convincing enough coz in third marlow gives full info on Drake.. that his real name is not drake, his father surrender "son" to the orphanage at the age of 5 after his mother commits suicide.. and according to fourth both brother were in the same orphanage.. and this detail would have showed up in marlowes investigation, not like sam was working for some shadow agency for not have any records.
even if neil and bruce had gone with the thread left in uncharted 2, when flynn comes to hire drake for museum heist.. and there nate reminds him that two people were killed lifting something out of that museum and one barely made out, which being nate.
i m just saying Amy version of nates brother sounded far more convincing that what we actually got.