Do you think Danny really likes Cristian that much? He talks mainly to Kieran, Eileen, Sarah and Jack from what I see. In the early days when Cristian caught everone talking about him (then fled to DR to weep) Danny didn't stick up for him, in fact he described Cristian as playing up to cameras. We only see them together with Kieran and they probably speak to kieran more individually. Danny took Sarah's side in the "celebrating Adjoa eviction" row.
I see an undercurrent of rivalry to be the "hottest one" that usually lazily gets attached to female hms except Sarah and Jade get along. Must have killed Cristian when Danny was voted hottest hm by public ( the rapper wasn't even a contender, ouch), then losing the arm wrestle.
Now I know how much male friendship are preferred and put on a superiority pedestal compared to female or mixed friendships, so fact that these two are not best buddies should not go unnoticed.