Well, it was 3-3 when Kaci touched 8 ball with his finger tip and he won the rack to lead 4-3. If it was foul BIH, Ko would win rack and lead 4-3.
Would not have made much difference to end result.
Anyway, it is nonsense to expect and trust someone to call foul on himself (especially when there is ref) when playing in final where winner gets record $40K (big increase from $25K last year) and runner up gets $20K
It is like the scene in one of last episodes of the overrated Breaking Bad.
Walt asks Ed "The Disappearer"-
"My money over there. What happens to it then? What if I ask you to give it to my family? Would you do it?"