So...
1. Teach can use COA afterall. It was a common theory going around that Teach can also neutralize haki including his own
2. COA doesn't stop Hancock from turning you into a stone, and even top tier Teach is at risk.
3. Yamato chose to stay behind because of the threats that can enter Wano(only realizing this cause of Shanks' haki) which makes that quick panel of her saying she's staying to live like Oden even more terrible. Why not the pointless contradiction?
4. Rayleigh's haki seemingly scares Teach but we need the panels. Oda didn't mention Ray and Shanks' COC in the same light for nothing
5. New pacifistas do indeed seem broken, given how they could make Teach go wtf