In 2011–12, his first full season playing in the WHL, Cave scored six goals and 10 assists for a total of 16 points in 70 games for the Broncos. He more than doubled these numbers in the 2012–13 season, posting 21 goals and 20 assists in 72 appearances with the Broncos. Going into the 2013 NHL Entry Draft, the NHL Central Scouting Bureau ranked Cave 89th among all North American skaters, and 42nd among WHL skaters in their final-season rankings. In advance of the 2013–14 WHL season, Cave was named the captain of the Broncos, succeeding Adam Lowry. In 2014–15, Cave returned as captain and set career offensive highs with 75 points (35 goals and 40 assists) in 72 games. He was awarded both Team MVP and the Coach's Award from the Broncos at the conclusion of the season.
