Even if people were offering 1 plus for Cernak its tough but I get it. You can call up Foote and I don't think Cernak would be kept in ED (I think Foote is kept as 3rd d). Bitter pill of course.
Its takes one team (with player's permission) to like Gourde, Killorn, or Johnson and make a trade. For example as Flyers fan. Say I can trade 2 for Gourde and then I trade Ghost for 2 to different team. Gourde is far from Flyers biggest need (log jam at c and lw all ready) but at that cost I am thinking long and hard about doing that. Thinking someone who needs a 2/3 lw c won't think as hard.
There is not going to be a 30 team conspiracy so that other teams will not trade for Killorn, Ryan MC, Johnson, Gourde, etc. because everyone is out to get TB. It maybe at cheap prices but still better than losing Serg/Cirelli.