I'm still not sure if I agree with this, or at least as a kind of definitive characterization. Carlos has shown brilliance beyond Jannik, but Jannik has been more consistently great over the last two and a half years, aka "The Sincaraz Era." Carlos goes on runs, then peters out for awhile, while Jannik has only very short spells of struggling, then ends up playing in every final for most of a year.
The simplified version being: Carlos = higher peak level, Jannik = higher consistent plateau.
Now their history tells an interesting story. Carlos exploded in 2022, maintained in 2023, then Jannik leap-frogged him in 2024. While Carlos did win the Channel Slam, he was actually more consistent in 2023, and I think the question going into 2025 was whether he could maintain his best form to equal or surpass Jannik again.
Carlos did win the year-end #1 in 2025, and had a winning record against Jannik, but Jannik was still more consistently great and if it were not for the ban, he would have been YE1 (assuming he kept his actual results and added a bit more out of the four Masters he missed). The point being, they were basically equally good in 2025.
Carlos seemed to answer that at the AO this year, finally winning it (though not having to beat Jannik), but then started going a bit AWOL...still good results, but Jannik took over and went on that crazy Masters run, while Alcaraz fizzled and got hurt.
Anyhow, I do agree that in terms of brilliance on court, Carlos surpasses Jannik. But in terms of day in, day out play, I think Jannik is more consistently great. How that will play out over the rest of their careers remains to be seen. Carlos has a sizable edge in Slams (7 to 4), but Jannik a slight edge in Masters (10 to 8), despite getting started winning them a year and a half later, and has the two Tour Finals.
If we look at just 2024-present, we get:
JANNIK: 4 Slams, 2 Tour Finals, 9 Masters, 19 titles
CARLOS: 5 Slams, 0 Tour Finals, 4 Masters, 14 titles
Meaning, I'd say that Jannik has the slight edge. That +1 in Slams for Carlos is more than made up for by 2 Tour Finals and 5 Masters.
Carlos is almost two years younger, but we don't know how they'll age. Either way, I'm rather curious to see how it all unfolds, and especially if one or two players can sneak into the mix and "Djokovic" them.