No idea why Sunak had a meeting with Johnson, it implies they have support on a par with each other when they do not. You want to explore options, you do it by back channels via supporters.
Does seem neither will work with the other and there are enough embittered supporters of both to torpedo the next reiteration of the Tory Govt, no matter who wins.
Even some of the headbangers and the Telegraph now realise Johnson is toxic and that Sunak is the only glimmer of hope. It’s only a glimmer though. The poison is too far gone. The Tory party has ceased to function as a governing party. An election and a fresh start is the only viable option.