Hearn's biggest problem, and one of Bitcoin's biggest headaches right now, is simply his ego.  He's taken his minority position and tried to redefine consensus.  Whilst it's true that the core team needed more persistent and effective pressure - call it lobbying - about increasing the block size sooner rather than later, XT is just an impatient ego-driven power play.  I'll give him the benefit of the doubt on whether or not that was his original intent but we are where we are.

Just my thoughts FWIW.