Different time periods as well. Heir came out in 91 when there had been no Starwars for almost 10 years and it was billed as the sequel to RTJ and seeing what happens to Luke and Co 5 years after. Quality doesn't come into it, people were going to buy it regardless. It would be more interesting/relevant to know the figures of Dark Force Rising and Last Command and how many people came back for more. I am still not sure if you could say Mara was the prime motivator either way, though she did become a popular character as that seemed more about Luke and Leia. I would not even use the Hand of Thrawn duo either she was in it heavily (complete with her own clone) since that was focused with advertising on Thrawn. I think it would be more relevant to maybe use the Comics which featured her and Alliegance and Choices of One which featured her heavily both on the cover and on the blurbs and in the books stories. TCW show came out after the awful Prequels and a terrible cartoon film. It was also set in between in a 3 year gap, so we knew how it would end. It lasted for 5 years and Ahsoka was always heavily featured as the main character. Though I argued that it was her and the (thankfully) re-written Anakin that was the heart of the show but thats just my opinion.