I wouldn't come to Pinnacle if you want to go to NWA. Very few Pinnacle pilots are even getting an interview. I personally know many Pinnacle pilots who are more than qualified for NWA and have their apps in. Of those, I only know of one who has even gotten an interview. I don't know if he got the job. I know some guys have left Pinnacle, gone somewhere else and then applied to NWA. They got an interview...
In any case, as others have mentioned why would you put yourself in the position of coming to Pinnacle now and possibly facing a strike during training/probation??? If you want MSP, I'd try Mesaba or Compass. You might want to talk to some Mesaba guys though. I understand MSP is pretty senior and you might have a tough time holding it especially if you're going to be a junior Captain.
Good luck.