I've wanted a follow up to Christian ever since I was a little gay kid desperately looking online through wikipedia, databases and lists for gay characters I could relate to, reading what happened to Christian and thinking it was terrible that it was seemingly dropped forever. And it would be tragic if that was the end of his story, being institutionalized against his will for the rest of his life for the crime of being gay while his sister just forgets he ever existed. And I imagine it's similar for Sina Grace.
Maybe this should have happened in Emma's X-Men Black issue, but there's no guarantee that the writer for that oneshot would have even wanted to tell this story. We'll see if they even acknowledge Christian when that issue comes out. The X-Books have been a mess when it comes to Emma's continuity and characterization for a while now.
From my perspective this mini has been pretty good so far. Like that Morlocks vs new Marauders story in issue 1, that was a metaphor for respectability politics and assimilation. It was about infighting within a minority group, how some people believe that you need to present yourself (your appearance and behavior) a certain way in order to receive acceptance and basic human rights from the majority. And if you don't then you're being a stereotype and you're hurting the cause for everyone else. It's that toxic grindr masc4masc mentality.
That's why I'm grateful that Sina Grace is the writer for this mini, because as an out gay man he has a different perspective, and he's using the mutant minority metaphor to point out a society issue and he's also addressing a long dropped plot point like Christian.
These are exactly the kind of plots I want from a book starring a gay mutant.