The reason they can’t lose Cummings is twofold
Johnson is a walking policy vacuum, he’s barely coping with a weekly PMQs session , without Cummings to the his shoes he’d be stuffed.
the other problem is that the minute Cummings goes, the next question Johnson is asked is when he knew & why he didn’t sack him sooner & Johnson has no plausible excuse, Starmer will mail him on it.
The cabinet & the rest of his MPs all know this, Johnson & Cummings were ill for 2 weeks & the government were paralysed with indecision
It wouldn’t bring down the government or even Johnson immediately, but it would be a serious blow
With brexit talk collapse.just weeks away & attempts to reopen country already looking desperately behind schedule