No, it's not to late to add him. Spider-Man is part of the Second Avengers, along with Luke Cage, Iron Fist, Wolverine, She-Hulk, and etc. Spider-Man will be perfect for the Avengers 3 movie since they are trying to phase out the main heroes (because contracts are expiring). Besides, his role wont be big since Iron Man, Doctor Strange, Ant-Man, and Black Panther will be the main heroes.
No, it's not to late to add him. Spider-Man is part of the Second Avengers, along with Luke Cage, Iron Fist, Wolverine, She-Hulk, and etc. Spider-Man will be perfect for the Avengers 3 movie since they are trying to phase out the main heroes (because contracts are expiring). Besides, his role wont be big since Iron Man, Doctor Strange, Ant-Man, and Black Panther will be the main heroes.