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Interview with Original creator Ben Hibon - "
To be absolutely clear I have never created or designed anything for Gearbox or Borderlands. Gearbox saw my work and decided to reproduce it make it their own without my help or my consent."
The video in question was made before borderlands, more importantly before gearbox up and switched the styling. Apparently the original creator was never attributed or compensated for his work.
When it comes to art styles I was ready to nod and say it was merely a coincidence, but when you start looking closer, there is so much in borderlands that has direct parallels to codehunters. For example, watch as the kid is carried on the large guys shoulders, much like how Brick carries Tiny Tina in the art in the credits. It just all seems highly suspicious.