Tsuru and Sengoku probably on the way to prevent Garp from bullying those yonko's crews

or to save Law
Garp can go all out here...He might single-handedly beat all the BB's captains there...
If Shiryu got coc haki too then it might gives a good fight...
In my perspective, Garp is a troll which is way bigger troll than Kizaru, he might beat the sh#t of everyone there, saves Coby and just leave the island while while eating his rice cookies or smoking Shiryu's cigar...laughing like a biggest troll like he always does..
This is the same guy who once almost kills Roger, The Pirate king for the Lord sake
