In theory. Remember Oda would never draw Mihawk negging Crocodile, he treats Crocodile with enough respect as if a fight between them would be high diff or something. So when I say Kaidou or Big Mom can get neg diffed I'm not saying Oda would ever draw that because he wouldn't take the disrespect that far.
We can't keep adding caveats and push goal posts every time a feat we don't like takes place. You said let him freeze a top tier, well he used the ability on the Final Villain in wifi mode and instead of the final villain in wifi mode breaking the ice then retreating, the ice was completely uncompromised. It was the same for when Loki defeated Harald. If Imu was pulling these feats off they wouldn't be questioned, it's just the character being given these things doesn't sit right with most.
In One Piece this is as far as you will ever get from Oda, like I said he will never even draw Crocodile get low diffed by Mihawk. We as readers can separate plot from how characters/abilities would interact.
Based on these spoilers I don't have a good enough reason to believe anyone below Gunkimo without a specific counter can break free.