Could Black Panther, or SI Spidey be assigned Fantastic Force ATA and use defenders (with their wild card) at the same time? Spidey could replace his defense with Suzie's, getting a 19, then while using Defenders, give that 19 to someone else (also using Defenders).

Absolutely.
I want to try the ATA on Luke Cage and team him up with HoT Daredevil on a Marvel Knights team.

Just for clarity, that has nothing to do with the combo, right?

Why not? Luke Cage has Fantastic Four keyword, can share it with DD. Just don't have the Defenders ta on them

That DD is not a wildcard like I thought though.
Combo does work with Cloak&Dagger though.

Really? That's cool!

Since that Daredevil does not have the Fantastic Four keyword or any team ability, Luke Cage cannot share his defense value with him.

Thanks. Just wanted to make sure you didn't have some super awesome combo I was missing.

Nope, just a glitch in the old mental database.