I feel like some people don't know that the reason Sabo remembered Ace and Luffy is because of the specific wording in the article. Sakazuki is Akainu's name, but it's also the name of the ritual Ace, Sabo, and Luffy did to become brothers. It was the combination of these names (Ace, Luffy, Sakazuki) that allowed him to regain his memories. Whenever Sabo heard of Fire Fist Ace before, he had some level of familiarity toward the name. But it's the combination of these words, not the act of Ace dying, that breaks through his amnesia.