Alright, lemme explain. Enkidu's ability has two main parts. Presence Detection and Shapeshifting.

Presence Detection means he is capable of detecting and analyzing "anything". On what wiz is saying with regards to Bob not being analyzable, that's nonsensical. Literally anything can be analyzed by Enkidu. The sword of rupture, Ea, is a weapon of which "only one can exist," one that even has the property of "cannot be understood" as a core of its profile. Enkidu can understand it and replicate it nonetheless. 

Besides, your main argument seems to be not that Enkidu can't "understand" Bob, but that he can't replicate him.

That's also incorrect. 

Enkidu is not just a shapeshifter in the sense of changing body. Shapeshifting EX is limitless. Physical, mental, magical, conceptual, and so on. How does he replicate Bob's power? Because his clay takes on the same conceptual properties. If Bob is a manifestation of human emotion, then he is closer to a "concept" than a living being, which is well within Enkidu's ability seeing as things like conceptual weapons are commonplace where he's from. A weapon "made of human emotion" isn't too out there for a Noble Phantasm, so there's no conceptual difference as far as Enkidu's concerned. A sword formed out of the dreams of humanity which loosed a blast of glory formed out of the condensed ideals of man is literally Excalibur's description, and he can replicate WAAAY more than Excalibur. He doesn't need to have the same "power" as what he's replicating to start, because his property is "limitless shapeshifting". That's his nature, changing at not only the material but the immaterial level.

So, he's not unique enough because A. Things like him exist in Nasuverse, B. Enkidu can copy "unique" existences like those, and C. Conceptual shapeshifting makes it all irrelevant.

Frankly, he would have stayed around the same level as Gil if you didn't try and use OPness to facecrush him. Enkidu counters things like that.

On Yuki's comment with even Bob having limits, that's fine. If his power source has a limit, then Enkidu's copy of it will have those same limits. If wiz insists it's limitless though, then so is Enkidu's.