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The danger with any analogy is that while it may aid in visualization, taken literally it can lead to false conclusions. One needs to be very careful visualizing mathematical concepts.
The Universe has no centre, the observer is the centre. If a galaxy was receding from the "centre" of the Universe, then any observer in the line of sight of the receding galaxy will measure the same recession velocity.
This clearly violates Hubble's law which shows that the recession velocity is proportional to the distance between the galaxy and observer. This is based on observation.
Hubble's law is explained by having the receding galaxies fixed in space and allowing the space to expand. Hence galaxies recede as a function of the increasing scale of the Universe. In this scenario there is no absolute centre, each observer in the Universe can rightly claim to be the centre.
This leads to the cosmological principle as explained by Craig.
Regards
Steven
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