All three phases now have six movies. The closest thing Phase 3 has to an Avengers movie is Civil War, which did have Spider-Man but lacked Thor and Hulk.
Some other factors include the fact that Phase 3's sequels (Civil War, Guardians 2, and Thor 3) outgrossed their Phase 2 predecessors while the newcomer Doctor Strange outgrossed Phase 2's newcomer, Ant-Man. And of course having a Spider-Man solo movie and using Iron Man and Hulk as supporting characters in other movies doesn't hurt.
But the real star of the show is Black Panther, which despite being the first solo outing of the character after one appearance in Civil War, is performing somewhere between Iron Man 3 and an Avengers movie.
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