For me, the single most-telling utterance from Johnson in that debate was when he responded to Hunt with "Jeremy likes to do the finer detail", snarkily, the implication being that this was a bad thing. So he either has not learnt any lessons from the past where his lack of being on brief has landed him in problems (Nazanin Z-R case) or he is aware of this failing but just does not care. Either way, that spoke volumes. I seriously fear for the future with him at the helm. I don't think he'll last very long, though.