If he wishes to complete the CGS, Alcaraz will have to avoid being upset at the AO by "someone else." If he is missing that title when he does an end-of-career retrospective, I doubt that it will provide much comfort to say, "I only lost in Melbourne because of a bunch of low-tier guys kept upsetting me. I'm sure I would have beaten Sinner if I had made it to a final to face him!"