#2 Brings more value to the booth than Maddin
I do understand that Dio Maddin comes from the world of the NFL and therefore there is a certain amount of recognition that he brings to the desk. But from his first few weeks behind the desk, it was pretty obvious that while the man has promise he wasn't ready for the big leagues yet. Also, while he brings crossover appeal of a kind, Samoa Joe is a renowned WWE star who brings a lot more value to the desk!
I know that a lot of people miss Samoa Joe in the ring at the moment, so while he is injured he can definitely man the desk for a while. Alexa Bliss did pretty much the same thing not long ago as an authority figure on RAW, back when she was injured. It's a much better use of his talents than just being on WWE Backstage!