In Deadpool 2, the director was "one of the guys who killed the dog in John Wick", he was referring to David Leitch, and John Wick was his directorial debut (uncredited) with
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Deadpool 2: John Wick Director Confirmed to Helm - YouTube
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Meet the Professional Shooters Who Made John Wick a Badass Operator | Military.com
Deadpool 2 John Wick Poster by Bryanzap on DeviantArt
Deadpool 2': What 'John Wick' Could Bring to It – The Hollywood Reporter
John Wick: Chapter 2 (2017) - IMDb
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DEADPOOL 2 Lands 'John Wick' Director David Leitch While Fox is Already Thinking DEADPOOL 3