I think it would actually be better if runo and Shea couldn't hear what the revenati group was saying because they don't have any special powers/things that allow them to hear there language
also Tanikazi and Akila and EVE could be translators for them and lets say if. tanikazi and eve and akila die/are missing Shea and Runo would have trouble talking to them, which would be fun to see in my opinion