As the MCDU post indicated, you would have to actually be in training and HAVE a seniority number, even if your type rating wasn’t complete. NK is hiring enough that the majority of new hires will likely have their base of choice before actually getting done with OE. Of course, that’s to be low man on the totem pole on reserve there. The real seniority issue will be where you can most quickly hold a line, since more senior people from other bases can still bid in above you. That won’t displace you, but it will slow your progression to lineholder.

But if you are coming in from a regional, by comparison it’s all going to be good regardless - at least once you get off first year pay.