Though the prospect of Deadpool coming back for a third film would have been enough to draw audiences in, Deadpool & Wolverine upped the movie’s box office appeal by bringing back Hugh Jackman to star alongside Ryan Reynolds. Jackman had previously played Wolverine for 17 years before retiring from the role, so his decision to return sent shockwaves among Marvel fans. Apparently, that included Reynolds, who co-wrote the film.

https://screenrant.com/ryan-reynolds-deadpool-wolverine-scene-most-terrifying-to-write/