Based on preseason I'd start with this line-up. If it looks like Hamonic isn't going to play this year we'll need to make a trade for a RHD. Hopefully Sutter and Motte are back soon which should greatly improve the 4th line. If MacEwen doesn't step up his game before Sutter returns we call up Lockwood to replace him.
Chiasson doesn't make the cut IMO, maybe he gets a 2way contact and is the 13th F or plays in Abbottsford.
Petan and Dowling belong in the AHL. Rathbone needs big minutes to continue to develop his game and will get those minutes in the AHL, maybe he's part of a trade for a RHD.
It's too bad we lost Gadovich, he might have been a good option on the 3rd line, but I'm glad he's getting a chance to stay in the NHL.