So Sanji and Zoro are now G4 level if they can beat a yonko commander but luffy pulled ahead once again by learning Future sight and Adv CoA....
damn
You seem to be forgetting something crucial.
Zoro always had the level of strength, haki and attack power he showed when using Emma he just never willed his swords to do so.
Enma is a sword that steals haki from the user and then makes excessively large cuts that the user never wanted to make.
So if the user wanted, they could have made those excessively large strikes with another sword like wado.
The only difference between wado and Emma is that with wado, if Zoro wants to cut a tree, he only cuts a tree, if he wants to cut a cost, he only cuts a cost. With Emma, if he wants to cut a tree he ends up cutting a coast. However he always had the strength, haki, attack power and skill to cut a coast if he wanted to with or without enma
So if your criteria is that Zoro will all of a sudden be g4 lvl cause of Enma, you are indirectly acknowledging the fact that he always had the haki, strength, attack power and skill needed to be g4 lvl. The only difference between now and when he didnt have Emma, is that before Emma, he decided how much haki to use and what to cut. With Emma, it goes against his will, takes more haki than he wanted then cuts larger than he wanted