It's a 16 team list per his contract. Pretty sure all 7 CAD teams will be there. So, that's more than plenty. Issue is that the good teams can't afford the $5.8 million cap hit, so I can't see Nash/STL/Wash/Pit, etc interested cause they can't take on the cap hit. A contract has to go the other way, which TB doesn't want.
Leaves more the mid to lower level teams. Some teams aren't going to be interested. LA, no benefit to them. They have plenty of 30 somethings, need to get young. Anaheim, plenty of young forwards to integrate and have Perry/Getz/Rackell/Henrique/Silf as their veteran forwards.
TB is trying to find a trade partner who doesn't need to send back a contract, who would also be on Callahan's list. TB should be willing to take back less if they don't want to take back a contract or retain.