In A New Hope, why didn't Chewy mention that.....

he fought in the Clone Wars, that he knew Yoda pretty well, and that he helped Yoda escape to his exile planet? Don't you think it may have come up in conversation at some point between Obi-wan and Chewy when they were on the rebel mission together. Like oh, btw, Mr. Obi-wan, I played a major role in the clone wars and was friends with this little green guy named Yoda, you might know him since you are like one of those Jedi guys. I'm sure Han could have translated for him.

And what are the odds that one of the only surviving Jedi in the universe, along with the future hero/Darth Vader's son, would just happen to run into Chewy and Han at some bar considering Chewy's past involvement in the rebellion? The backfilling that Lucas did during the prequels was really unnecessary. Did he really have to make Chewy and Yoda friends? Couldn't he have just showed Chewy fighting as a member of the wookie army or something? Damn...