WPG is probably getting draft picks or prospects back in trades like these. Byfuglien - Hamonic could be interesting though if Big Buff commits to the Islanders first.
Coyle and Ladd have almost identical stats. The Stars won't be trading a young, cap friendly forward for a Ladd rental. Think Ladd and his 11 goals in 50 games, is not going to get really big offers (though he only needs one) as a UFA.