He get's the Soba stand and him meeting Toko the way Zoro met her adoptive father so that they are the two SH's who have stakes in protecting her from Orochi after Yasuie's execution
He builds up fame as an outlaw by fighting Denjiro's men and then the Flying Six, so that he and Zoro are immediately recognized as the leaders of the group that Rebels against Orochi when they save Toko
and then he and Zoro get to fight X Drake and Denjiro.
He saves Nami, Robin and Shinobu from Hawkins and X Drake.
He saves Momonosuke who was the main target of the Beast Pirates in Onigashima, which makes the current events of older Momo flying with Luffy and fighting with him possible.
He protects Zoro and get's him to Chopper which makes it possible for Zoro to come back in action.
He saves Chopper and the Samurai on the Live Stage and inspires to keep on fighting, which makes possible Zoro's recovery, as well as the tides not turning against them when everyone was losing morale when they thought Momo and Luffy died.
And obviously, the Wings, the Stars, recognition both from crewmates like Robin and characters like Marco, and him and Zoro defeating Kaido's top two men and getting Luffy in reach of becoming the King of the Pirates.