Again I am newer to this so I don't really have an educated background about the subject, however with the CMB, the waves come out in a spherical shape, wouldn't that have to have had a center? I'm not trying to argue any point, I'm simply trying to get a better knowledge around the subject with theorizing so with the math behind it I wouldn't know where to start.. with the falling towards the center, I forgot the isotopic expansion with my lack of knowledge around the subject I looked at it with blinders on. with the speed of falling, the gravitational pull would depict how fast we are falling towards it. again I would like to point out I am just trying to get a better understanding for myself I'm sorry if it seems like I'm arguing or something.