If Johnson does manage 100, and Mordaunt drops out, then Tory MPs vote again and its seems likely Sunak would probably win that round hands down - but that round counts for nothing other than 'guidance' for the members as they then vote - and bearing in mind they were naive enough to vote for Truss they may well be naive enough to vote for Boris the Liar.
If so, then the new Tory PM wouldn't have the support of the majority of Tory MPs and I can't see how the Tory party doesn't implode - but if they do I'll be cheering from the sidelines (especially at the discomforture of the Scottish Tories).