Ah, yes! Now I remember these. Looks like someone in the factory got a hold of some molds and decided to make their own. I'm kind of surprised that Tunghori didn't get in on the action.
I'm guessing that since Target had that exclusive pack with Iron Man Mk V, Whiplash with lightning effects & the Naval Hammer Drone sitting around that they weren't keen to bite on this other exclusive. But the Iron Man Mk V armor was EVERYWHERE, and the line as a whole didn't sell as well as Hasbro had probably hoped. And I think that probably trumped the potential appeal of that Black Widow figure as well as the no helmet Iron Man and War Machine.