What has intrigued me as of late is Mihawk words about armament haki… if your swords were clad in haki they would not have broken. For some reason I never really picked up on Zoro breaking kings haki clad sword with his KoH technique . This being said it isn’t out the realm of possibility for Sandai to get destroyed but I surely hope not, and on top of that it was there to tank hakai it seems like it should have snapped then if anything.