When in a conversation, all party members who are listening to the conversation (be it your own party members, or other co-op partners) should be able to chime in, when skill rolls/class specific stuff are needed.
I already had a few conversations where, let's say, investigation was needed. I knew my co-op partner was better at it, but tough luck, it was me who started the conversation. This seems silly, as he would be standing right besides me. I feel like he should be able to help me make the roll.
MINOR SPOILER: one of the companions you get, ask if you are a wizard... I was not, but my co-op partner was.. It would make sense for him to say that he was for example. MINOR SPOILER END.
