He splits the parliamentary party but I think has enough support to be one of the two - even those who might prefer other hard Brexit types, he'll be seen as massively popular with the rest of the party and therefore "very electable". And someone who can take on Farage. This is their problem - they will analyse it as having to reclaim Brexit party voters. But if they go after that group, they will lose traditional "one nation" conservative support.Is Boris sure to get onto the ballot? I know he is very popular with the party membership.
But looking at the rules it seems to be Conservative MPs that whittle down the contenders to 2, and then the party membership vote on that ballot.