For for that specific Tyrants article, I think "deceased" is inappropriate when the member died far after the group no longer exists. This is becuase the sidebar lists "members," so the actually relevant information is the date of membership, not the date a person died (while no longer a member). Furthermore, becuase the article uses present tense in decribing the activities of Tyrants, the use of the term "deceased" without indication of a specific date is confusing, in general.
So I think "deceased" should be removed, and replaced with "(d. 2027)" , etc.
For Gunther, I think "(until dissolution of group)" should be the appropriate marker.
Instead of just adding an article to the "Cleanup" category, it's better to add Template:Cleanup and give a description of the way(s) the article needs to be improved. Otherwise, other editors may not know what to change in order to improve it.
For example, apart from the missing sections, I'm unsure what's the issue with the Deus Ex: Human Revolution storyline article. I still have to get around to finishing it, but once I do, I can work on other issues with it if you think there are some.
Ah sorry. I was using it to mark it because I wasn't sure yet if it should be fixed up to only be told from Adam's prespective. Otherwise, some parts of it read like what's off the HR page (like the first chapter already reveals stuff you don't find out until much later in the story).
Ah I see, that's because the purpose of the HR storyline page was to describe what exactly happens, not how the story is revealed from Adam's perspective. Once it's done, I plan to shorten the plot summary on the Human Revolution page somewhat and link to the main storyline article. I don't know if the MD one should be structured similarly, or left as is.
Also about that, I still think information about what Jensen does in Mankind Divided should stay on his article, just in a much more condensed form. I didn't intend for the storyline article to replace it entirely. I might try to write something now that summarises it.
If you think it works fine the way it is, it's okay to leave it like that.
My aim with the Human Revolution one was to explain the story without people getting confused, so explained everything as I went along. I know some people had trouble following it when they played it, but maybe it's not necessary for the MD one.
You might have noticed that I removed the contractions from The Heist (i.e. "you'll", "it's" etc.). This is to keep the page relatively formal (I know walkthrough articles tend to be less formal than other types of articles though), but to also keep the language as simple as possible for non native speakers. Thanks if you can try to do this from now on!