Possible Plot Hole?: Kieran Can't Be The 1st Riser!
Because there were others already out of their graves walking about by the time he lifted the lid of his coffin. (Season 1, Episode 2)
What he said in the latest episode could just be him mis-remembering things? (About him being the only one out of the grave at the time.)
I'd prefer Kieran not being the first riser since that would be way to cliche!