I agree with most of that, but I think he just got lucky at the start. He didn't change anything but I think the team just got a collective boot up the erchie when Lennon was sacked/wasn't sacked.
There was no point in his time at Hibs that I thought he was the real deal. That might be more about me than him, but I'm usually as defensive as f*** about Hibs players and managers and Heckingbottom was the first I had no time for.