As we've agreed, this is not a new or novel idea, but it does illustrate why the patent system is broken. A quick, cursory search yields a patent from 1994 for the exact same thing. " Preferably, a motor (27, 44) powered by the auxiliary power unit of the aircraft is used to drive the wheels of the landing gear."
https://www.google.com/patents/EP0756556B1?cl=en&dq=electric...
Search Google Patents for "electric taxi airplane". Even so, there are many subsequent patents on the same overall concept. A broken system.