As an ally, he saved the MC on a whim and yeeted from multiple top tiers, he became a Warlord just to troll the govt, changed the gears of the world, fended off an Admiral while telling his allies where to escape, fought Yonko back to back
Without Law, the SHs would be stuck in Punk Hazard and end up as Caesar’s playtoys getting gas-diffed by his oxygen depletion
There’s a reason why Law was considered an honorary SH. Mfer was doing more than everyone except Luffy combined
As a villain, Law would be the Blackbeard equivalent except more cunning and with powers that could change the course of everything (the “Ultimate” DF)