Kaddu earned letters in football, basketball and track at
Vacaville High School. He finished his senior season ranked third in the Monticello Empire League in
tackles with 92 stops (69 unassisted), 5.5
quarterback sacks (3rd in the league) and two
interceptions, including a season-high 13 tackles vs.
Vallejo. In addition, he also carried the ball 10 times for 78 yards and grabbed five catches for 155 yards and one touchdown on offense. He helped Mike Papadopoulos’ team take home the
Sac-Joaquin Section Division I football championship in 2006 with a 37–36 victory against
Merced, the school's first ever football title. In
track & field, Kaddu excelled in jumping events, posting bests of 1.83 meters (6–0) in the
high jump, 6.41m (21–0) in the
long jump and 13.58m (44–4) in the
triple jump. He also competed in hurdles (15.49s in the
110m hurdles) and threw the
shot put, posting a top-throw of 14.30 meters (46–10). Ranked as a three-star recruit by
Scout.com, Kaddu was ranked as the 33rd-best
strongside linebacker prospect in the country and was included on its California Top 100 (99th) as one of the state's top recruits. He was also considered a two-star recruit by
Rivals.com. ==Professional career==