Kerfoot for cap purposes only.
I don't believe retention is needed if Kerfoot is in the trade, depending on how many guys they have on IR.
Value is a first, second and fourth.
The fit seems to be good with him on the second line with Tavares and Nylander/Marner

Seems to be the flavour of the week right now.
Barton to replace Villeneuve on the Marlies.

Small cap savings next year for Calgary if they want it.
Can retain if they plan on going big game hunting and need the cap space. Swap the 4th with a 3rd in that case.

Jarnkrok got a 2nd, 3rd and 7th last year.

Defencemen always seem to get greater returns at the deadline.

Heinen added just for extra forward depth of they want it. He provides no value to this trade and can be removed if necessary, just giving him a chance to play in the playoffs.