It feels like Excalibur feels he needs to do more when it's just him and JR, which isn't entirely wrong, but it comes off as "if I keep talking, Jim won't be able to say something that makes him look bad/old/out of touch". With Tony around, you have a guy who's been doing broadcasting during the time he was away from wrestling so he was already good to go. He just needed to get familiarity with the product.