I agree with that. But obviously not especially "weak." Same way that Carlos is no slouch on HCs. He won his first Major at the USO.
Well IMO not
quite the same, Alcaraz has won multiple Masters (3) & a slam on HC, in Sinner’s case, neither so far. In fact, his lone clay tourney win was 3 years ago in 2022.
As to Sinner saying that Clay is his weakest surface, well
result-wise he’s made Grand Slam 2 QF’s & SF & a Grand Slam final on the red clay as well as a Masters final. That trumps his best results on grass IMO.
As of now, Sinner is a HC specialist. Which is not a dig as 17 out of his 19 wins have been on HC including 3 Slams, 4 Masters & a YE ATP. He is
that good on the surface. Hell he could conceivably win enough just on HC in the years to come to remain #1 without winning Majors on other surfaces.
But again I do hope we get a Wimbledon final between Alcaraz & Sinner.