Bottom line, it's an out-of-continuity story. Ennis actually *has* written an in-continuity Batman before in Legends of the Dark Knight a long time ago. In that story, he wrote a perfect Alfred (no fumigation jokes) and Bruce in character. So, he can do it, but I don't personally put the burden on him to do it on a Black Label book. There, Ennis is going to write Ennis Batman, for better or worse. I like it personally but I understand those who don't.