Because Whitebeard was about to die. And because Ace’s life was at stake. And because Shitebeard was much stronger at Marineford. Your analogy is incoherent. lol
I thought Kaido asked Big Mom to get his Devil Fruit for him? So you’re saying he chose not to fight Garp because he had more important things to do, such as pestering Big Mom about getting him a Devil Fruit? Lol
So why couldn’t Kaido fight Garp while Big Mom got his Devil fruit for him?
I could actually see Kaido in the middle of fighting some fodder being like “Hey Lin Lin did you get my fruit yet?” Lol
I thought Kaido asked Big Mom to get his Devil Fruit for him? So you’re saying he chose not to fight Garp because he had more important things to do, such as pestering Big Mom about getting him a Devil Fruit? Lol
So why couldn’t Kaido fight Garp while Big Mom got his Devil fruit for him?
I could actually see Kaido in the middle of fighting some fodder being like “Hey Lin Lin did you get my fruit yet?” Lol
Lol it's not guaranteed Kaido gets a DF all by himself hence he asked BM to give him one in case he couldn't find/get it. She was like a sister to him.