People can say whatever they like but in the end the food chain of One Piece for now looks like this ( power-wise ).
1. Prime Xebec.
2. Prime Roger, Prime Whitebeard, Prime Garp.
3. Prime Mihawk, Prime Shanks ( sorry for me portrayal wise he's just behind Whitebeard ) you can say that I give him the benefit of being a later boss.
4. Prime Kaido, Prime Big Mom. OG Admirals.
5. New Admirals.