Durant had a championship, right after he joined the GSW, Lebron had the same, so Giannis has to think of that as well.
If I would rank Lebron, AD, and Giannis, I will put Giannis in the last position.
The Greek Freak gives a show in the regular season but can't do it in the playoffs, that's what separates him from the two.
Durant went in the NBA finals during his time with OKC, so did Lebron during his time with the Cavaliers (before he transfer), Giannis did not achieve that level of success.
agree that Giannis did not proved his value in the play-off, during season teams are relaxed and it is easier to have great stats, if you are good, but great players show themselves in the play-off, when it is all-in, you can see many times that top teams from regular season do not reach finals in the end
it is a long season, and it is important to qualify for the play-off, but you do not have to do your best in regular season, i think that defence play starts with play-off, in regular season, most teams are playing attack only