I don't see the Sens parting ways with any of their core identity prospects. In my opinion that includes at minimum 2 forward lines and one d pairing: Greig-Pinto-Sokolov, Ostapchuk-Kastelic-Boucher, Sanderson-Kleven
The Sens already made a trade for their top six forward target so the only other big trade they will be looking to make will be for a top 4 d. They have plenty of other valuable prospects as trade chips that aren't as much identity players. In particular if they are acquiring a d man then it would make sense that one of Brannstrom, JBD or Thomson would be the key prospect going the other way.