The redshift calculation on the face-on spiral shows a distance of around 800 million light-years. It doesn't LOOK 4 times the distance of the others. It would have to be extremely huge to look in proportion to the others in the group.
I like to think that the face-on spiral is just extremely huge.
Thanks for the astronomy lesson! I enjoy starting the day with this thread.
It looks 4 times farther away. It's structure is much finer in terms of angular measure; assuming the nearer ones have halos of visible stars and the spiral also does and the halos are similar in true density, the face-on galaxy appears to have several times the amount of fine detail and so must be extremely huge and farther away.