Spoilers said GB trapped everyone including Yamato in a wood prison and they couldn't escape.
I was talking about Shanks' COC and the Marines were benefiting from Kaido's reign thanks to his weapon factories. Marines wanted to get involved with a 2 Emperor alliance so I don't get why GB needs to be singled out as a power level one.
Never said that and subjective nonetheless since Oda never fully committed to Kaido being #1 and repeatedly called it a rumor. Gives him leeway to do whatever.