Ottawa will need to resign Erik Karlsson soon who is likely going to get McDavid money. This will likely push out either Turris or Stone, who both only have one year left on their deals. Calgary sends Ottawa a blue chip goalie prospect which they desperately need, Kylington, who could pan out as EK lite for Ottawa, and a decent forward prospect who could step in given the opportunity. It's a big package for Stone, but he is a very good player, and is very highly regarded in Ottawa. Ottawa will need the extra salary cap space, unless they can unload one of Phaneuf or Ryan. Stone is from Western Canada and having his brother around for 3 years should make him easy to resign.