This seems to be an nice forum, so I'll repost my comment from the BA blog here, in hope that someone who knows a lot will answer.

Regarding the galaxies in the Abel cluster that seems to be stripped of dark matter:

Doesn’t the dark matter theory also predict that there should exist galaxies devoid of dark matter? I mean, if u look at the famous picture of the bullet cluster, u see the heated gas separated from dark matter. Won’t that gas eventually cool down and form its own stars and galaxies, without dark matter? What kind of galaxies will be the result of that? Are people looking for such galaxies?