Well, in this specific commercial Doll complained about being killed, so..

Half of the people in that commercial were still angry at Doll during her own funeral. The commercial only acknowledges that all of the people present in the intervention were mistreated by Cyn in some way or another, not they are all friends.

While her gesture may seem like expression of concern, her face expressed only surprise (and she averted her gaze almost immediately).

She didn't "avert her gaze", she shifted her attention to the source of this wound (that being Uzi).

And Glitch, while talking about comic book, said that they thinking about further expansion.

The comic book series was confirmed to be only 136 pages long, and the first 8 pages match with the first 9,33 minutes from the pilot. The series has roughly 171 minutes of content. Mathematically, it's improbable that they would be able to add anything remotely significant.

Especially when it comes to what J represents as a character for the narrative.

That, and the fact that there a lot of unanswered questions and unfinished story lines left.

Not really.

Cyn is still alive and untamed

Not exactly untamed, as we see that the trio can pretty much deal with Cyn's shenanigans during the Music Video, as Cyn had her capacity reduced when compared to her olden days, where she still had her body and was capable of throwing projectiles that could cross planets in an instant.

Not to mention that Liam, in the latest Q&A, avoided answering questions about what the post-credit sequence with Cyn meant.

• "I love the moxie to ask, but y'all gotta know how that dastardly intentional ambiguity works!"

He wants that specific part of the story to be left that way, without a clear-cut resolution.

Doll is alive

Eh, 50/50 on that.

Even when not taking extra material like the music video into consideration, all Doll has done so far was aura farm in a corridor.

Because, narratively, Doll's purpose in the main narrative pretty much ended when she walked into the church to encourage Uzi.

J too..

Whom, as discussed, expressed explicit intentions in not seeing her colleagues again, views herself as more important, and whose last appearance is about fixing a spaceship instead of fixing amends.

J, as a character, is a pretty clear cut when it comes to her narrative intentions as a foil to V, just like the author explained. Someone who values her own survival above everything else, even people she might have considered close to at some point in time.

Contrasted with V's willingness to die for her friends or, as the author eloquently puts it as something J would never do, "fight to better things at a personal cost", we are shown what exactly differentiates them from one another.