In the grand scheme of things, it was Law who let Doflamingo and Smoker off easily. He had them dancing in the palm of his hands literally
Law saved Smoker on a whim. Gave Caesar his secretary’s heart back, decided to cut his seastone chains and switch his personality with Tashigi back
Law coulda let Kaido go ham on Doffy’s ass instead of being petty and going to settle the score himself. Kill Caesar and be done with, no negotiation
If we wanna go even FURTHER, without Law there would be no post-TS. Luffy had massive physical and mental trauma in Marineford and only Law came in to 1) take him away, 2) operate on him and save his life, cuz Chopper sure as hell wouldn’t be able to
Like genuinely Luffy, Doffy, and Smoker all owe Law their lives. Goofy lives freely as a Yonko, Doffy is safe in jail instead of Kaido’s new pelt cape, Smoker is well at least he’s not a weak woman anymore