Again, GSP's reign had noting to do with MW. He jumped the line at MW, signed a contract to defend his belt if he won, won and didn't defend. He ducked. You can consider the earth to be flat, that doesn't make it flat. Facts are facts, just like the FACT that he did sign a contract to defend the belt, even though you considered there not being any official proof.
Irrelevant. Fedor is a natural LHW yet he fought at HW his entire career. Frankie is a natural FW yet he fought dozens of fight at LW. Nobody forced GSP to move to MW. He willingly did it, skipped the line even though he had zero fights previously at that weight, signed a contract to defend, and didn't defend. That's the definition of ducking. If Conor went up to WW, fought and became champ, promised he will defend then ran, he'd be ducking just the same.