Funny enough, Fox was drafted in the third round of the 2016 NHL Entry Draft by Brad Treliving and the Calgary Flames. While he refused to sign with the club, since entering the NHL, Fox has become one of the most dynamic offensive defensemen in the league, winning the Norris Trophy in 2021. Scouts have compared Kiviharju to Fox for his slighter frame at 5'11 and as Daily FaceOff's Steve Ellis noted, Fox is who Kiviharju models his game after.
With building a blueline the priority for Brad Treliving and the Leafs, it won't be surprising to see them draft a defenseman in the first round, it's just a matter of which one will they choose.