Talk:Songs of Serkonos/@comment-34477949-20180312130810/@comment-16533050-20180312183212

The statement quoted means exactly what it says: if the duo is killed in an earlier mission they won't appear in a later one. There may be other reasons as to why the duo don't show up but no one has listed them.

Your problem could also be a technical issue or glitch. I've been hearing a good deal about them recently by people on Reddit.