I had not heard of the Crow until it was annouced for wave 3. Only hardcore computer gamers requinized it and don't even get me started on the scale thing. It seems to me that FFG had a particular set of requirements for a ship and then they searched until thay found one that fit the build. Wave 4 could be all over the place with them trying to fill particular roles required in the game.
According to wikipedia, the first game in the series (DARK FORCES) alone sold 952,000 copies. So it's not that obscure of a ship. I'm not a "hard core" computer gamer, though I am a pretty big SW nerd. I recognized the ship right away.
I really don't think that FFG chose this ship just because it fits the scale. That would be an awful risk.