So having seen most of the highlights now, Johnson is badly harmed. Johnson either admits that Cummings comments are true and that Johnson isn't fit for PM and is possibly culpable of manslaughter OR he admits that Cummings is a lying, dangerous, manipulative and vengeful liar. In which case you have to seriously question Johnsons judgment in employing Cummings in such a role and why Johnson took advantage of such behaviour to 'get brexit done' and win the PMship. Either way Johnson is a callous murderer OR he is a gullible fool taken in by Cummings.
He won't deny it, as he won't have proof too, and he knows DC won't have raised these issues without either having proof, or without being in a room with multiple people (of which you can't assume all will lie, as they might not all have been Tories, and not all of those will like BJ).
So, what will happen is BJ will not respond to 90% of it, will play down the other 10%, then throw a smoke grenade, probably do some moaning about labour, then some bluster, then some other horsheshit (possibly about brexit), then some stuff about vaccines (which is seemingly not down to him) and obviously largely carried out by the NHS.
Then the press will probably go after Cummings, to try and discredit (on Tory behalf, as they fund the Tories), so it looks like it's not coming from BJ (but it really is).
Then the Tory flock will whinge about DC, and that "he wasn't trusted before apparently, so why should he be now?".
Except for the problem with the above line implies one of a few main scenarios:
1) That DC is a serial liar, and they (Tory/ brexiters) have just fell for all of his crap earlier (basically showing themselves as gullible fools)
2) That he was telling the truth all along, in that way they trusted him before so should trust him now
3) He was telling the truth before, but for some reason isn't now, and is just doing this all for the crack, to try and wreck his own career, life and future job prospects
Obviously, 3 is the least likely outcome, he's really not that daft, he was smart enough to sway a vote of 32m by conning 10% of that.
The thing is, like a lot of people are saying, most whistleblowers or even "grasses" don't generally do this without a mass of proof, and looking at how clear DC was on his time and dates, this lot is obviously well diarised and recorded. He doesn't seem the kind of guy to have "not kept his receipts", as everyone all over is saying. You really need your duck's in a row to go after these kinds of people otherwise you will get taken apart, and seemingly no 10 don't have the competence to take this guy apart, especially as their failings are clearly recorded.
It was clear who the main fools are, and to be honest it's the ones who most realised were fools all along, BJ and Handjob etc.