Of course Nel is important to them. If that was not true, they would not be Nel's brothers! [Unbreakable bonds, forged by a lifetime this child cannot remember, resulting in a 'family' that has no blood relations, but at the same time will never break apart.]

Nel is getting beat up a lot in fights, but that is okay because everyone is protecting Nel and Nel is helping heal everyone later.

[She is completely fine with being weak, because she knows people care about her.]