Originally Posted by ThePowerCosmic
Makes sense. Except I think they'd have to get more from Wakanda.
Exactly. But I think it will play a part in this movie.
QS and SW are brought in secretly by the WSC to go to Wakanda and retrieve some vibranium for Project Code Name: Ultron.
This gets you the eventual turn from antagonist to protagonist for the twins, Avengers assembling to fight them, battle in Wakanda, losing to the unexpected abilities of SW, furthering of the concept of the Avengers creating Ultron, ties with AIM and WSC (Redford...?)... Lots of potential for growth.