Originally Posted by ThePowerCosmic
Well Pym could be the creator if Ultron does come from the future. He wouldn't have to be involved in AOU, because he hasn't created him yet in that timeline. Maybe they find out who created him toward the end of the movie, but at that point it's too late to search for Pym. It could be a guessing game throughout the movie, wondering who was responsible for Ultron's creation.
They're not messing with time travel. A marvel exec was quote yesterday saying that.