As I said to SGR, that's relies on you singling out GB's words as a power level statement.
1. He's literally there to take out the guy who beat Kaido
2. Marines and an Admiral had no problem getting directly involved with a 2 Emperor alliance
3. WG was getting weapons from Mingo via Kaido's weapon factories
4. Wano is unaffiliated with the WG
1- The taking down of Kaido was a group effort, even the news say so so as far as he is concerned they are weaker than Kaido individually and are currently recovering.
2- They had no problem stopping the alliance from happening but didnt due to lack of manpower and unknown samurai.
3- excuses
4-It is Wanos non affiliation that is causing GB to attack right now. Kaidos existence wouldnt have let him do that as per his own admittance.
GB was comparing Momos bullshit to Kaido, nothing else.