I think his sniping at Obama for the criticism of the handling of the COVID-19 crisis is pretty telling.
From what I have seen, Obama has kept a pretty low profile on WH matters, because as Harold MacMillan once said in similar circumstances he wasn't seeing the dispatches. The privileged data. And for all we mocked Major - he kept his counsel until Brexshit. And how much has Dubya opined since leaving office?

Now fast forward (pu-leeeeeease) to when Twitler has left office. How silent will he be then?

Let us numerate the odds.