[Cool Guy]

Does gravity travel through masses? I think it does. How do we account for that if it is gravitons? What is its speed through different masses?

I think I will go with the idea of a rubber sheet for now.

[RightWhale]

Gravity is a field and does not move. The field will be non-smooth where there are masses, a bumpy set of values. The thing they are measuring the speed of is the change in intensity and direction of the field at two different points with respect to time. The speed of propagation of a change in intensity, rather than a motion of the field. The field can't move.