Barring any more injuries my guess is the Rangers will break camp like this:
Lafreniere-Trocheck-Panarin
Smith-Zibanejad-Kreider
Kakko-Chytil-Cuylle
Rempe-Carrick-Edstrom
Brodzinski
Vesey-inj
Fox-Miller
Trouba-Jones
Schneider-Mancini
Ruhwedel
Lindgren-inj
Sheshterkin-Quick
Final cuts--Othmann, Berard, Mackey.
If Panarin's hurt enough to miss games is a question too. Also Laviolette seem to like Mackey quite a lot. OTOH Mancini seems to share a lot in common with Miller and Schneider. Big, mobile, defensive oriented--perhaps better offensive instincts than Miller/Schneider. He moves the puck and defends well and that's a hard combination to beat. I really like defensemen with size and who can really move that defend well. If the Rangers were to pair him with Fox and it really works then Lindgren depending might be the odd guy out of the top 6. If both Fox and Jones are going to be regulars that's enough smaller guys on D AFAIC anyway.