DS TB is extremely hard compared to LS TB in contrast to the events during the battle of Hoth in ESB! Factors that hamper progress and prevent guilds from winning more stars are: - Empire faction r...
Many top players have multiple light sided teams at the level of their stronger dark side teams. This is partially due to the legendary/op characters difference and partially because of the number of easily accessible good light sided characters.
A required sub faction (bounty hunters) is bad.
DSTB was added later than lstb and is therefore considered by the developers as more late game and therefore harder.