I don't know how you'd measure that but while KI might have a Top 3 greatest/most consequential shot in NBA Finals history, he doesn't have a big enough body of work yet, IMO. The Ringer looked at buzzer beaters in NBA history. LBJ has the most, at 5, in NBA history. MJ had 9 in his career in all games which leads all entrants.
KI and KD would look better getting the shot, and both are pretty shooters, but LBJ's resume also can't be denied.