I appreciate y'all's opinions on the matter. I'm kind of split on it, and like I said, I just find it a bit morbid, especially since it's two names of two brothers who both died in a tragic accident. I think a person's name defines in part who they are, and I want my child to have 'his' own name, if that makes sense. His whole name would be a repetition of those who came before him--his first, middle, and last name. Nothing would really be 'his'.
By the same token, I do acknowledge that these names obviously have significance to my husband. He's a very quiet, laid-back guy, so when he usually says something, he means it. For him to express wanting to name his firstborn after them, I know it has deep meaning behind it for him. I also think if I was in his position I would feel differently.
I like the idea of using them as two middle names. I hadn't really thought of that. What we really need to do is compromise on the name. Not really an issue right now, but it will be in the future.