Are you sure they won't be covering something else at the same time to make it a half episode?

No, I'm not sure of that - but what else is there to cover? Kikyo's death is getting its own episode (#8) and Kaou is getting its own episode (#10)...so unless they sneak something in totally of the timeline, it's looking good that the entirety of the Hell arc will be covered.

Considering how many people have been bitching about they wish it was getting more than one episode - dude. I'm just glad its being animated at all!