Hmmmmmmm it’s interesting , Oda has gone out of his way to make it clear God Knights used to be pushovers Against The Legends. BUT at the same time The Strawhats are not Legends yet, just because the Prime Roger Pirates beat them often doesn’t mean Strawhats will. You also have IMU here taking over Gunko’s body . So there’s a lot of variables here to consider.
I wouldn’t write off this group yet