They are backing him because he is as much of a committed Leaver as May. With these cunts, it's mostly all about shades of Remain. Some are more overt, some are more subtle about their beliefs and intentions. If you want to know where they really stand listen not to what they say, look instead to who is supporting them.Javid's demeanour and platform is very similar to May's. I'm amazed that so many Tory MPs are backing him.
For example, Stewart has that arch-EU federalist cunt Kenneth Clarke seconding him. That tells you all you need to know about what kind of "Brexit" he would deliver.