He didnt start tennis much later that average, people misinterpret that, he started competing internationally 2 years later than average, he played tennis since he was a child, children younger than 12 dont train all that much anyway, he was just more focused on skiing but that doesnt mean that he can make that Up now, It basically makes no difference at this point, and i dont undertand the slam final thing, Alcaraz has beaten sinner two times at slams and has won more slams and Big titles being younger, he is clearly the superior player, as for the rivalry, yes i agree its too soon to put one over the other, but against the field, unless sinner wins wimbledon, US open and some more masters, hes still behind Alcaraz.