IMO, the only D that really applies to based on the ice time is Schultz and Ference.
This I'll disagree with you on. How our ice time should be divided up this season:
1. Marincin
2. Petry
3. Fayne
4. Schultz
5. Ference
6. Nikiton
Putting a #1 up there moves Marincin into a more complimentary role, puts Fayne and Petry into the 2nd pairing role, and pushes Schultz/Ference into bottom pairing minutes. You could also move Fayne onto the top pair, and have Marincin/Petry as the 2nd pair. Nikiton becomes the 7th D, like he was in CLB. Realistically, McT wouldn't have gotten Nikiton if he brought in a #1D, which would have been a bonus.
Easy to say, all but impossible to do.
We've seen it happen before. It doesn't happen often, but it does happen.
Before parting with valuable assets, we could try playing the D we have in a way that maximizes the effectiveness of the whole unit.