By definition, and endorsement includes the payees signature, so based on this, I agree with the McCoys.
However, the presentment warrenties of the UCC 4-208 state the bank of first deposit a warrenting to the drawee bank that the person who negotiated the check legal authorized to do so.
In English, you are stating that the payee received benefit for the check even if the check is not endorsed, so based on this, I agree with the Hatfields.
In other words, under the current UCC, it doesn't matter.
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