Maybe "contractual issues" means that for the purposes of a multi picture deal, AOU would count as one movie. They might prefer to save him up for better things. See this interesting if slightly OT article about the CEO of Marvel (and also what it says about how unwilling they are to pay for the talent to have entourages etc. They must LOVE him as he gives such good value when out doing the publicity!) http://www.hollywoodreporter.com/news/how-marvel-became-envy-scourge-720363