On serious note
Garp is dumb or the Oda god-tier writing trying to make old gen look badass making him casually pulling upto fight a Yonko crew
Enter a Yonko mainland with full confidence saying he gonna smack them.
Got himself push into the corner by Yonko underling.
Remember BB isn't even there, plus Laff, Devon, Van, Berguess......
Note a chance in hell he's gonna succeed rescuing Coby or his own life if all BB crew were present.
It's stupid writing just to make Garp look badass to take on Yonko.....ya ya ya, there's no consequences because help will be on their way whatsoever.