I still don’t personally see it as invalidation though? Kaido said abilities alone can’t conquer the world…. Roger though could do it with haki alone because haki transcends all. Rox plan is for abilities sure but he also has insane haki. Roger is the one here who should seemingly pop off. I assume here is where he brings the world(imu) to heel stopping the guy.
Not much to say on the second one, but I will say this the scans seem to show that the combined attacks did nothing to imu even though adv coc was used. I would wager that none of them are using it the way that Gaban is currently using it in the story vs the holy knights. Even though he said he was rusty he defeated sommers and left him in agony as sommers himself said. Even though it’s more prophetic (joyboy will be the one to beat me) it might not be to crazy to say that the kaido of today thinks and believes imu can’t fight him because like Roger he found out the secret to hurting imu