Is there anything unusual about that - about having so many wins before you've played in a major? Yes. Quoting a PGA Tour email:
Patrick Reed is believed to be the first player with three PGA TOUR wins before his first major championship appearance since Sam Snead won three times (1936 West Virginia Close Pro, 1937 Oakland Open, 1937 Bing Crosby Pro-Am) prior making his major debut at the 1937 Masters. Reed has played in 51 TOUR events entering this week’s Arnold Palmer Invitational presented by MasterCard but has yet to compete in a major.