Reconsidering Star Wars IV in the light of I-III

So it was mostly R2 and Chewbacca who were in the know.
A New Sith, or Revenge of the Hope
20 years earlier, Chewbacca was second in command of the defence of his planet. He’s there in the tactical conferences and there on the front lines and is a personal friend of Yoda’s. When he needed reliable people to join the embryonic Alliance, who else would Yoda turn to but his old friend from Kashykk? Given his background, there is no way that Chewie would spend the crucial years of the rebellion as the second-in-command to (sorry Han) a low-level smuggler. Unless it’s his cover. In fact, Chewie is a top-line spy and flies what is in many ways the Rebellion’s best ship.
The Millenium Falcon may look like a beat-up old freighter but it can outrun any Imperial ship in normal space or hyperspace, hang in a firefight with a Star Destroyer or outmaneouvre a dozen top-of-the-line TIE fighters. It’s a remarkable feat of engineering and must have cost a colossal fortune to build. How does Han come to own a ship like that? He only thinks he does, actually it’s Chewie’s. Half-way through RotS, we see the Falcon landing at the Senate building on Coruscant. If it’s the same ship (which of course it is) then it was the personal transport of one of the senatorial delegations – a much more likely source to commission its design. That delegatino must have later joined the Rebellion and given it the use of the Falcon. In fact, if the delegation is the one from Kashykk, then the ship may have belonged to Chewbacca as early as RotS.
Han and Luke get medals but Chewie doesn’t. Actually, Leia offers him one but Chewie turns it down. He got one of those things from Yoda about 20 years ago, but there’s no way he can tell her that.