Quoted from J85M:All depends on the licence and the deal made, although we saw the Guardians and Spider-Man in Avengers, that’s the MCU and done by Marvel/Disney themselves
Theres no saying they include them in a deal to someone looking to license the Avengers. They could require completely different licenses and a lot of extra dollars. War machine and Winter solider should definitely be there at least you’d expect to see them.
Since it's comics, Stern only needs to deal with Marvel. See Spider-Man Vault. Sony had zero involvement.