So that was your one free wavier exempt piece, what happens when Sekera's back? They're still going to need to waive 1 of Walker, Caggiula, Auvitu, and Gryba.
Are they actually going to keep 9 defenceman on the active roster?
I'm a bigger fan of Slepy than Cags, but I'd still be against trading either them. Neither hold much value, so moving them won't get you much help on the main roster, and I don't like the idea of giving away young and cheap NHL talent for low quality magic beans.
The obvious answer is to move out the older guys, who are seeing a reduced role this year and/or won't be back next year. Looking at you Maroon, Auvitu, Gryba, Cammy, and Letestu.