He seems to follow a much more "classic" curve of progression. Maybe he'll have won more in 10 years, that's very possible, but in comparison to the trio in this thread, at his age, it's hard to bring him into the debate. He's not a worldclass ITT'er like Evenepoel, and he isn't a worldclass climber like Bernal. I doubt he'll ever become as good (while still excellent).
The reason somebody started this thread is because Bernal, Evenepoel and Pogacar, at their age, have something "extraterestrial" about them. That's not the case for Sivakov. He actually said this himself in an interview with French TV, who said he had a fantastic season. He said it was a bit underwhelming compared to these guys.