He definitely needs someone who can get through to him when he's not listening. Foreign policy is apparently a touchy subject with him. He considers himself an expert on foreign policy and so doesn't really listen to anyone who disagrees with him. The problem is that he's not an expert nor could he ever be. There's no one person in the world who has comprehensive knowledge of all global politics. Afghanistan appears to show exactly how this leads to failure. Biden wouldn't listen to anyone who advised caution in withdrawing and as a result he was blindsided.
Biden needs someone who can say "Joe, this person knows what they're talking about. Listen to them" and Biden actually do it.