"Avengers: Infinity War" had the biggest box office weekend ever, and even Marvel's Troll Number One was impressed.
Actor Ryan Reynolds, who as Deadpool has his own place in the Marvel Universe, wrote a congratulatory tweet that also contained a simulated denial letter from Tony Stark, who jokingly explained why he was not in the movie:  From a guy who never knows when to stop, I'm glad you never did. Congratulation #Avengers . pic.twitter.com/voJshTKx5E
The letter is from April 14, 2012 – days after the Hollywood premiere and weeks before the official Opening of the First "Avengers" Movie
While Disney bought Marvel in 2009, complex licensing agreements meant that it did not really control screen rights for a number of characters, including Deadpool. Fox owned these.
Disney's deal last year to acquire most of Fox, however, could mean that there is still hope that Deadpool could join a future "Avengers" movie.