I highly doubt that Deere engineers did anything from an engineering standpoint other than work with Berco to figure out how to fit the undercarriage to JDs skid steer chassis. I still talk frequently with my old Bobcat field sales rep, and he said that Komatsu introduced the "JD/Berco" undercarriage at BAUMA (trade show in Europe) over 3 years ago and has been selling them in Europe since, prior to releasing them in the States last year.
Did JD give Komatsu engineering assistance too? Let's face it, JD and Komatsu use the same Italian (no offense meant) undercarriage, with Italian drive motors, Italian planetary drives, Italian rollers, and a Bridgestone track. Pretty innovative. I'm nottrying to start a flame war here, but there really isn't much difference from Bobcats, CASE's/NH's, Komatsu, JD undercarriages. They all use Bridgestone tracks, Passisni or Berco rollers (yes, even Bobcat), and pretty much the same rail design. I still think it boils down to the features and benefits of what's in the chassis when it comes to rigid mounted machines. Other than that, they're pretty much all the same.