Indeed.
That said, however, Gravity propagation **could** be isolated from all involved components.
It is the Moon's gravity and orbital motion that causes our tidal movements, after all.
It has more to do with the propagation speed of water waves than it does gravity. Also, you got to take into account local geography and especially resonant cavities (Bay of Fundy, anyone?).
Indeed.
That said, however, Gravity propagation **could** be isolated from all involved components.
It is the Moon's gravity and orbital motion that causes our tidal movements, after all.