Pretty sure Perunovich plays on the right side, and to be honest...I don't see him cracking the lineup anytime soon, if at all. I watched a bit of him and he didn't impress me at all. I'd take Dunn any day over him.
Scandella won't be around long...so that would leave us with Krug, Dunn, and Mikkola on the left. Then Parayko, Faulk, and Perunovich? on the right. Bortuzzo and Gunnarsson are basically just 7/8 Dmen.
Basically my point is that if we trade Dunn, it will just leave a hole at LD in the very near future. Wingers are plentiful and easy to replace, good defensemen are not. Also we don't have room in our top 6 for Debrusk, we need a RW with Tarasenko out, not a LW.