What do you mean? I interpret it as that if Gremmy is capable of letting Zaraki use his full power while still wearing his eyepatch. Well, theoretically Gremmy's powers would be able to do it, but as the fight between them made perfectly clear: if Gremmy cannot actually imagine it, his powers cannot accomplish it. And it's made clear that Kenpachi's power was greater than what Gremmy could imagine.