As a senior, he averaged 15.8 points, 4.4 rebounds, 4.2 assists and 3.0 steals per game, leading Mount Vernon to a 23–3 record and second straight New York Public High School Athletic Association Class AA state championship.

As a senior, he paired with Buddy Hield to lead the Sooners to the Final Four while averaging 12.6 points, 4.5 assists and 1.4 steals per game.

[8] Seven days later, he was acquired by the Reno Bighorns of the NBA Development League as an affiliate player of the Kings.

[10] On April 11, 2018, Cholet Basket of the LNB Pro A announced they had signed Cousins for the rest of the season.

[14] On July 24, 2019, Cousins signed a one-year deal with Hapoel Jerusalem of the Israeli Premier League, joining his former college teammate TaShawn Thomas.

[17] On July 31, 2020, Cousins signed with Hapoel Gilboa Galil of the Israeli Basketball Premier League for the upcoming season.