Now first things first, I am an imperial player and I have never even played rebels before but Bail Organa seems like a really good card to me. Like better than Pryce good but you never see him and I wonder why.
Bail is like Pryce a tool to allow you to go last first and I think in context he is much better at that for the rebels than Pryce for the Empire. Rebel ships are already through the board significantly cheaper than Imperial ships. So it has always been way easier for them to get more activations and with that get the last activation. Now with Bail you have a tool to guarantee the first activation in a crucial turn. But not only does he make it very easy for rebels to get last first he also allows the rebel player to do this while having a full 400 point list. If you want to go last first with Pryce you still need to fork over an additional 20+ points for a bid (and even than there is no guarantee for first player). With those 20+ points rebels can buy a whole additional ship (with a common loudout. A Comms Net GR-75 is 20 points!). And since you have a full 400 point list you will likely also have the advantage of playing your objectives. Compared to a Price last first a Bail last first gets to have roughly 20+ more points and second player objective advantage. That's insane!
Now you may argue that Bail is pretty bad if you get first player, but just think about that. You just got away with getting first player with a 400 point list. I would gladly take that (of course this needs to be on a list that wants to go last first.)
And lastly Bail is the perfect defense should you face a Pryce list. The biggest danger when facing a Pryce opponent is them getting last first and Bail can guarantee that that wont happen. Bail and Pryce trigger simultaneously, so if Pryce is the first player they will have to determine the Pryce turn first. You can than just set Bail to trigger the turn after Pryce guaranteeing that the opponent does not get the last first. And if Pryce is not first player than that means not last first for her.
So why do we see him so rarely, especially in top level games?