I just want to share a small piece of observation that may be beneficial to the mission scalability balance in future versions of Heroes of the Aturi Cluster.
I noticed that in several FFG new products, when playing as a single hero player the trend is to choose two heroes figures instead of just one. See Mansions of Madness 2nd ed, Descent 2nd ed and Imperial Assault campaign for three examples. This will eliminate some needs of testing scalability as it is often quite a large difference between 1 and 2 number of heroes (much more different than between 2 and 3 players, for instance). In addition, mission setup diagrams and squad composition table may end up less cluttered.
You can do this by just adding a small note that says if you play by yourself you have to choose at least 2 rebel pilots.
You can even limit the lower number of rebel pilots to 3, by requiring a single player to choose 3 rebel pilots and two players to choose 2 rebel pilots each.
This may open up better scaling based on rebel pilot skill and chosen difficulty.