Originally Posted by jaqua99
where does that come from then?
IF the masters are involved.. it will probably be characters that have been introduced in the MCU. Its pointless to introduce a character IN Avengers 2, just for the sake of it. Each of these characters has a personal relation with their respective hero
You've missed a second option, which I've seen some rumors to support:
Use Thanos as the villain in Avengers 2, and the Gauntlet is one of many reasons to favor Avengers 2 over Avengers 3.
Yes, it's possible the Masters of Evil could appear in Avengers 2, but you're looking at turing an ensemble film into a double ensemble film. There's a risk of it turning into another Expendables - having to spend so much time developing each character that it turns into a mishmosh. That'll translate to box office problems.