Why was this something we needed to see? I mean it makes sense that Red/Gold leaders were part of the space battle, it makes sense Mon Mothma is there, it makes sense that Bail Organa is there, it makes sense that Tarkin is there, and even if I thought it was a little unnecessary, it makes sense that Leia was included.
There is no reason that these two guys show up here, bumping into two incredibly important Star Wars characters, only to meet two more incredibly important Star Wars characters a week later. And both groups' missions are focused around the Death Star plans. It's shit like this, like Chewie knowing Yoda or like Anakin building C-3PO that makes the galaxy feel small.