Neither Smoker not Koby are Garp or Sengoku.
The only one that parrallels Garp is Sakazuki , the strongest marine of their era and the one to actually fight Luffy ... Koby/Smoker are not IT
or at least just like Blackbeard represent Xebec and Whitebeard together maybe Garp represent in Smoker Koby Sakazuki together but Sakazuki is for sure the one that represent the strongest marine like Garp used to
The only one that parrallels Garp is Sakazuki , the strongest marine of their era and the one to actually fight Luffy ... Koby/Smoker are not IT
or at least just like Blackbeard represent Xebec and Whitebeard together maybe Garp represent in Smoker Koby Sakazuki together but Sakazuki is for sure the one that represent the strongest marine like Garp used to