Ehlers was asked to take the spot on PP1? I didn't hear that.... Interesting tidbit. Odd that he wouldn't jump at the opportunity, given that the 1st unit often gets most, if not all, of the PP. Maybe he's assuming Wheeler won't miss any time.
But as far as Nash being on the PP1, there's no justification for it, even in practice. Why put him there in practice if you have no intention of him being there in a game? I'm not buying the, "it's just at practice" angle.