"Let me fight him, why did you not let me fight him"...... Why would he when WB and BM who he lookup to them as his mentor/older bro/sis called to run away.
"He asked for WB and BM help"
I don't recall Kaido asking WB and BM help, or says help me fight Garp.
You see your superiors and seniors asking you to run and its just 1 opponent. You question them why run?? And not even fight back?
This is same as Oden asking WB why don't they fight back the fodders Marines when WB called to move away when being chased by them
And How do you interpreted as Kaido asking for WB and BM help or pleading them like he needs help. It's WB who aksed them to run.
Kaido was clueless about the situation and why they don't fight back........
Meaning Kaido have no issues fighting Garp, but he follow his older bro and sis words in this case, and he had a mission to do also. What's the problem?