So here is a realistic scenario I could see Ottawa moving forward with.
1. Zibanejad + 17th for Bobby Ryan
2. Rights to Nikita Filatov for Jonathon Blum
Cory Conacher - Jason Spezza - Bobby Ryan
Milan Michalek - Kyle Turris - Daniel Alfredsson
Jakob Silfverberg - Jean-Gabriel Pageau - Erik Condra
Colin Greening - Zack Smith - Chris Neil
Jared Cowen - Erik Karlsson
Marc Methot - Jonathon Blum
Chris Phillips - Patrick Wiercioch
Craig Anderson
Robin Lehner
Then maybe move a few other prospects like Hoffman or Gryba for picks. Otherwise have guys like Hoffman, Prince, Noesen, Stone, Gryba, Borowiecki, Ceci, etc. as call-ups.