well for one, they haven't even signed russell. so I am not even worried about him. The way they are looking to add talent right now is through the draft. Which so far, it looks like they have had success. They are using the free agent market to sign small complementary pieces that won't take away roles from the young studs. they have to see what they got, and they're not going to have as much of an idea what they have by bringing in free agent 2nd and 3rd liners that the kids would be playing behind.
And just because they signed Martin, doesn't mean they think he's GOOD. It means they think there is a role on this team for him in Toronto. Which there may be, as there is a definitive lack of toughness on this team. A line with Komarov / Laich / Martin might be a good fit.