Joe is amazing at his job, but he also knows how good Dom is and what an amazing fighter he is.
Joe yields to Dom to try and let him shine because there is so much respect. Joe knows the intelligence of Dom and knows Dom is one of the all time greats.
BUT... this formula and Joe almost having too much respect does NOT let Joe be JOE!
Joe needs to get loos and in the vibe of the fight... joe wants to hear what dom says and that takes him out of his game.
Dom loves to talk and will challenge anyone on anything... so it comes across as him challenging and correcting Joe.
* just a thought I had... what do you think?