Hugo's World Cup Win and WTTC silver (especially in the fashion he won them) are IMHO bigger than anything that these slams represent from a historical perspective and his form as it evolves this year is showing he is capable of that level again. There is a lot of TT yet to be played before we start thinking in terms of Federer, Novak and Nadal - those guys were somewhat equal and dominant for decades, it isn't even clear who is where and what given how new and young Felix and Sora are. You may not realize that Truls is 24 while Felix/Sora are 19-20 and are barely beginning. Sora hasn't even played in an Olympics before and that is his only lifetime goal. Since you are admittedly new to watching and following the top level, you may better appreciate the limitations of these analysis later.
I mean, none of these guys have even touched ML/FZD peak dominance yet. WCQ is maybe the closest and of course the eras are different but still.