Trying to upload photos, (too big). It's not the oil pump drive gear, it's the outer spring loaded scissor gear on the primary gear, item number 3 in diagram above. (hard to tell on the diagram.). It's a 2 piece gear and the outer part self destructed.
Was super lucky that the engine didn't lock up. Oil light didn't come on so assuming the oil flow wasn't restricted enough for that. Still more investigation to be done on engine.
In the second picture below the primary gear no longer has the outer scissor gear attached. Desi's bike looks the same and I'm hearing that some race bikes don't run the scissor gear. Scissor may not be the right terminology, damper might be better.