Regarding the Goblin's ridiculous size-increases, remember that the Hulk is another offshoot of trying to replicate the Super-Soldier formula, and that we've already established cases of industrial espionage in the Ultimate Universe by the time this story occurs. We know full well Otto helped Justin Hammer while he was working for Osborn - And then Nick Fury states that Osborn made big noise about what Oz was going to do, except he was years behind and his work was getting sloppy when it was coming toward time to deliver.

So, methinks that Norman just might've hired someone to steal a little bit of Bruce Banner's work.