3. Boris is fairly good at playing for both sides at the moment
He is often vaguely wet when it comes to actual policies as Mayor of London; and actually sometimes says or does someting reasonable.Not because of any particular principles, but because any Mayor of London depends on attracting some Labour-leaning swing voters.
On the other hand, he also wants to be leader of the Conservative Party; and that depends on attracting people to the right of Cameron, who may revolt against him with support from UKIP sympathizers.
Difficult task, doing both at once; wooing away the soft Ken Livingstone voters, and being Nadine Dorries' darling at the same time. At least the Vicar of Bray only had to pander to the different monarchs successively, not simultaneously!
Boris may be considered as a Bold Maverick by some, but frankly when looked at closely, he'd make Nick Clegg look like a man of firm principle in comparison. And as with Clegg, I think it will all unravel at some point.