If GB was truly afraid of Kaido and was avoiding him on purpose....he would've come to Wano to capture the island under WG rule.
But no...he's coming after Luffy...the man who defeated Kaido. Why would he plan to capture a Dude who helped him out ? Did Smoker aim to capture Luffy after Alabasta after helping defeat Croc. Did Aokiji aim to capture Luffy after Luffy defeated Croc. Did Fuji aim to capture Luffy after Luffy defeated Doffy.
No they all let him go....and we're secretly thankful for him. So again in which universe would GB want to angerily capture Luffy if Luffy helped him out and did something he couldn't lol.
It's just simple logic:-
- WG needs Kaido for weapons
- In turn they don't attack him and he has immunity
- In turn Wano has immunity
- Kaido is defeated
- WG won't get their weapons
- Immunity broken
- Thus Admirals are now invading.