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Ok, let just be a bit serious. He is just a B.O.W without a name. That why Umbrella called him, X because they can't figure out a name for the poor guy (maybe that why he want to punc- hug Leon/Claire to death).
I guess the name John was taken by someone else in the RE universe. Maybe Umbrella hate Dr John Clemen so they banned the name for B.O.W subject. No wonder the guy want Ada to expose the truth and instruct how to activate the self-destruct mechanism though he died before sending that letter.
I did say a bit serious. A bit.
Cardboard boxes are amazing. You could use it to sneak around. Drop on someone to stun them. Heck if you aren't satisfy with ramming, try a tank through co-op.