As a Quora user this seems to be a big setback for the company. Charlie has always been more engaged in actually using the product and interfacing with the community. Adam has picked it up a bit lately, but their stats below show who was more engaged with the product.

Charlie: Users They Follow - 3474, Topics - 578, Questions - 1240, Answers - 1524, Edits - 36951

Adam: Users They Follow - 587, Topics - 338, Questions - 890, Answers - 848, Edits - 24374

This could certainly just be a result of their focus at the company, but it is interesting.