Bendis, who did Prime, and Fraction, who does IIM, are both notorious for ignoring other people's canon. So, for that matter is Brubaker. This led to a complete lack of continueity between Steve coming back and the beginning of the Heroic age. Steve fluctuates between costumes. Tony's armour changes, and he gains and loses the arc reactor. Steve reunites with New Avengers twice, and with Tony for that matter. Steve's house both blows up and does not. It was a mess.