However, when I run into something like this, I am quietly relieved that there are others out there who put a whole lot more time and effort into analyzing science fiction worlds/universes than I do:
If we accept all the Star Wars films as the same canon, then a lot that happens in the original films has to be reinterpreted in the light of the prequels. As we now know, the rebel Alliance was founded by Yoda, Obi-Wan Kenobi and Bail Organa. What can readily be deduced is that their first recruit, who soon became their top field agent, was R2-D2.
What I've read so far of this is quite well-thought-out, and (I think) very interesting. I'm just glad that somebody else came up with it. :-)
(Hat tip: By The Way)