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To put this timeline in perspective, 400 million years ago, fish on our planet were developing teeth. In terms of the age of the Universe, it would mean that this galaxy popped into existence as fast as you could blink an eye. To suggest that an entire galaxy could suddenly appear within that short timeframe is akin to the long discredited theory of Spontaneous Generation of Flies. In other words, the timeframe stretches credulity in the extreme.

It seems to me that the only way this paradox can be justified is if spacetime itself is flexible; that as one looks further back in time, the sum volume of gravitational weight of the Universe has to be taken into consideration, that as we observe objects at greater distances - from our point of view - time becomes more compressed as we approach the Cosmic Event Horizon.

Thought model: Imagine you are in the center of a glass sphere consisting of several shell layers. you are in the smallest and lightest center shell, it weighs less than the proceeding outer shells. The next shell out is heavier, the next one heavier still. Each layer makes the glass universe-sphere heavier, so that in accordance with Einstein’s relativity, ‘heavy’ slows down time.

I propose that Redshift manifests itself in two ways; local spectral Doppler blue and red shift that we see when we observe our local galaxies approaching (blue,) or receding (red,) and an overlapping Universal Gravitational Redshift, the phenomenon that increases exponentially with distance, so that the closer one observes to the Event Horizon the more compressed time is.
Consequently, these distant galaxies only appear to have been created in this short timeframe because from our point of view, time is compressed. An observer within that galaxy looking at our galaxy would experience the same phenomenon; our galaxy would be at the lip of the Cosmic Event Horizon, the timeframe for that observer would look compressed, and so would think that our galaxy formed ridiculously fast.

Thoughts?