-Ottawa needs to dump Joseph (Negative Value) to open up cap space to acquire Brandon Tanev (Negative Value), but Seattle doesn't want to take Joseph.
-Tanev has negative value to most teams, but has positive value to Ottawa because they plan to use him to wooooh his brother into signing. Let's be adults here and accept tampering exists, Ottawa has reason to believe Chris Tanev will sign if they get his brother. So this trade is more about Chris than it is about Brandon.
-Calgary's ownership badly wants Iginla (within reason). Ottawa can get a similar tier of player at 9.
-Calgary takes Joseph (worth about a 2nd) and gives Ottawa a late 2nd to swap picks. Effectively, two 2nd round picks worth of value.
-Ottawa sends the late 2nd to Seattle for Tanev with light retention to make it cap in/cap out with Joseph.
-Ottawa then sends a mid round pick to Dallas for the rights of good (but very old) Tanev, and signs the contract that they totally weren't tampering to get. Of course, they could wait until July 1st, but things can change, better to lock it all down.

Ottawa exploits Calgary's familial situation, while Seattle exploits Ottawa's familial situation. Seattle remains unexploited.

I don't think Tanev would cost a 2nd. Probably a 4th. If they retain 50% maybe you could warrant the late 2nd. Can't see Ottawa moving back 2 spots for a 4th liner making 3.5M$ tho.

ottawa giving up a better pick and a better player than they're getting in return.....ottawa laughs and hangs up the phone

I’m not convinced that Tanev has more value than Joseph. I’m particularly not convinced that his value is equal to that of a 2nd

Joseph>Tanev

If CGY really wants Iginla I'd consider 7th + 39th for 9th + 28th

However I think OTT and SEA will both take a D-man at 7 and 8 so CGY shouldn't get desperate if Iginla is available at 7

OTT declines.

Joseph > Tanev.

7OA > 9OA