🚀 go-pugleaf

Just so I'm clear on this: 

If one adds two test particles to the universe, the general
expansion does NOT by itself cause the test particles to move
apart. Subsequent movement of the test particles depends on
their mutual gravity and the gravitational or electromagnetic
forces imposed on them by other matter/energy in the usual,
non-cosmological ways. Distant objects will in general 
move away from the test particles, because the distant objects
inherited their velocity from the big bang and continue to move
with that velocity (slowing due to mutual gravity, to which the
test particles add trivially). One can say that space itself is
expanding, but this expansion does not drag particles along
with it; it might be better to say that the expanding distribution
of original matter/energy creates new space as it expands. 
A big, misleading flaw in the "expanding balloon" or "rising loaf"
pictures is that added test "particles" (dots painted on the balloon,
raisins stuck into the loaf) WILL move away from each other.

Right?