I think Marine Nationale will go Arkle based on the trainer comments. I think it's basically worth considering two scenarios:
1) CONSTITUTION HILL GOES CHASING:
Personally - at the moment - I think that would mean:
Constitution Hill - Arkle
State Man - Champion Hurdle
Impaire et Passe - Turners
I don't think there is anything coming from the novice hurdle ranks to threaten State Man if there is no Constitution Hill and he will only be 7.
Henderson is a pretty conservative trainer. I think - if Constitution Hill does go chasing - then he will go Arkle at 7 and then open company at 8.
Mullins has talked about Impaire et Passe going to the Champion Hurdle but my hunch is that they will come down on chasing and dodge Constitution Hill.
2) CONSTITUTION HILL STAYS HURDLING:
Constitution Hill - Champion Hurdle
State Man - Arkle
Impaire et Passe - Turners
In this scenario, I think Mullins will think no point in keeping State Man over hurdles to get beaten again and may consider chasing.
FWIW I think Henderson wants scenario 2 and Buckley scenario 1. I also think we won't know until September earliest.