Why not also focus on Jared and Manafort? Maybe they disclosed this meeting on the paper work though.
Praying for the best.
I think that's the answer, Kushner's disclosure is what triggered this story so there's nothing more they can pursue there. Trump Jr. on the other hand has the email chain they can use to make waves, plus being his father's son he's a more choice target for attacking Trump and the Trump brand.