The N2 will not be in the ground idle range because idle is set by NG (62-64% or thereabouts depending on the specific machine). 62-64% NG will give different N2s depending on if the drivetrain is being driven (ground idle) or if it is in autorotation. I've usually only seen a bit of a N2/NR split when autoing machines with C20 series engines in them.
Mike