Originally Posted by Spider-Fan
The Hulkbuster armor would not be like addind Venom in SM3. Venom was an entire character with the added element of the suit bonding with Peter first. The Hulkbuster armor is just a piece of technology. That could easily be put into Avengers.
Agreed, basically if they are going to have a sequence where the Avengers stop the Hulk, then Tony will need the Hulbuster armour.