For Blackbeard, it makes sense, he's always been a sly rat.
For Shanks though, I didn't expect him to be such a coward & hypocrite. He could've fought Big Mom & Kaido for the poneglyphs but never did.
And didn't he call out Green Bull for being afraid of the new era? Turns out they went and took poor Kid's arm when he was a rookie and now are ready to gangbang him to get the poneglyphs :saden: