I don’t know how one can exclude garp from PK level I just don’t get it
Roger was pirate for Decades before God valley incident, we saw young Garp Sengoku & Tsuru as marines, they were practically friends by the end Roger & Garp. I believe Roger pulled ahead of Garp in power. Just like Luffy in last arc, 3 major powerups in a week lol. Not that big of gap but still, Roger says to Garp, we almost killed each other, that doesn't mean Roger=Garp, Roger mentions in Oden flashback, for marines to send Garp or Sengoku to make it interesting, that doesn't mean Sengoku or Garp=Roger.
It's like King & Katakuri/Roger & Whitebeard
Queen Jozu Smoothie
Garp Rayleigh Sengoku
also on this lvl is Shanks Kaido Big Mom
Cracker/Shiki lol
ALL Commander lvl but some are 1st 2nd or 3rd.