Here is some more theory-crafting, but this time it is for the Rebel Troopers. The Rebel Troopers have quite a bit less synergy with the spoiled upgrade cards, compared to the Stormtroopers. Rebels want to Move + Attack or Dodge + Attack often, but there are no upgrade cards yet that synergize well with those actions sequences. Targeting Scopes is less appealing if you are not going to Aim + Attack frequently, and Concussion Grenades are less appealing when you are already tossing black dice. Therefore, I would be much more inclined to run light on upgrades with Rebel Troopers.
Dodge + Attack/Move + Attack (Generalist Troopers)
Rebel Troopers (40 pts)
Extra Trooper (10 pts)
TOTAL: 50 pts
These cheap but versatile troops can put together a decent fire base or dash in to take a position. If they stay behind cover and dodge, they will be very difficult to damage.
Aim + Attack (Fire Base Troopers)
Rebel Troopers (40 pts)
Extra Trooper (10 pts)
z6 Trooper (22 pts)
Targeting Scopes (6 pts)
TOTAL: 78 pts
The z6 will roll a lot of blanks, so the rerolls will always come in handy. This is a spray 'n pray unit. When you get a lucky roll, it will decimate the enemy, but it is painfully inconsistent, even with the scopes.
Reload + Attack (Anti-Armour Troopers)
Rebel Troopers (40 pts)
Extra Trooper (10 pts)
MPL-57 Trooper (32 pts)
TOTAL: 82 pts
In a meta full of armour, these could be useful. Two of these units could effectively pin down an armoured vehicle for a long time. It seems like you would take lots of Troopers in this configuration or none of them.
Here is an example Rebel list, buildable with 3 cores.
Luke Skywalker + Force Reflexes + Jedi Mind Trick (180 pts)
AT-RT + Laser Cannon (90 pts)
AT-RT + Laser Cannon (90 pts)
AT-RT + Laser Cannon (90 pts)
Rebel Troopers + Extra Trooper + z6 Trooper + Targeting Scopes (78 pts)
Rebel Troopers + Extra Trooper + z6 Trooper + Targeting Scopes (78 pts)
Rebel Troopers + Extra Trooper (50 pts)
Rebel Troopers + Extra Trooper (50 pts)
Rebel Troopers + Extra Trooper (50 pts)
Rebel Troopers (40 pts)
TOTAL: 796