what she means:
finnick odair is viewed widely as a superficial character who was only self-obsessed and okay with being a killer, but really he survived the hunger games as the youngest ever winner, went through that much trauma and survived at 14 years old, grew up to fall in love with an emotionally damaged girl who had gone through what he had, yet she had turned out more externally damaged, grew close with a sweet old woman, was willing to protect her with his life and literally physically carried her on his back in the games, despite the risk to himself, stood with the rebellion against the Capitol even though he was their darling, publicly defied and spilled secrets about the president, married that same damaged girl he loved even in the middle of a war and had a child who he never got to meet, helped a psychologically damaged and unrecognizable Peeta and defended him, protected his friends and team against the lizard mutts, and actually begged for Katniss to throw a bomb down where he was, because he knew that it would save her and the rest of the team, even though he would die.
consider: post-mockingjay, annie and finnick’s son has a “bring your dad” day coming up at school. since his biological father passed away before he was born, he asks johanna to go with him to school on that day. johanna, who’s spent a lot of time in district four helping raise annie’s son, is absolutely moved and honored, and she gladly agrees to go as his dad.