Whoa! Tim Miller was going to have Black Sawn (from Gail Simone's very underrated run) in Deadpool 2! After the 20:00 mark. He also clarifies that he had a guy for Cable who was NOT Kyle Chandler (whom he never actually met) and that he had no intentions of betraying the first movie's spirit and instead make a generic big budget blockbuster (which I never thought were his intentions anyway). Such a great guy and director. I'm still somewhat upset that he's not returning (even though I'm a big fan of David Leitch).
You should watch the entire video, though. He's also quite candid about Ajax's villain plot being weak (which I don't entirely agree with, it's simple and serves the story).