1 SBD per case but 2 Kenobis & Artoos WTF?
Obi and R2 as 2 per case. Messed. Up.
Why Kenobi 2? The SBD should be x 2! 
Why are you guys so surprised that Obi-Wan and R2 are 2x per case? Have you not been paying attention to the last 10+ years of Hasbro case packs?

Why Kenobi and not SBD? Because that's how it works with Hasbro,
main characters will almost always get packed at a higher ratio than the secondary characters. There is a much higher likelihood that Grandmas and Moms in the toy aisle to buy a gift for little Johnny will recognize Kenobi or R2-D2, but little chance they would recognize the Lava Miner.
In a perfect world for collectors, sure it'd be nice if they were only 1x per case to make room for more Army builders, but the case has to be a reflection of Collectors (2x Galactic Marine and 2x Airborne Trooper) and Kids (2x Kenobi and 2x R2).