Merging separate seasons (and specials) of this anime into one Title

Hi contributors, I am trying to merge various separate titles into one anime, of which they're officially the other seasons of, with no change in cast and crew and no gaps in their original runs:

Special 1: "Goku sayonara zetsubô sensei" (2008-2009) -- 3 episodes

Season 3: "Zan sayonara zetsubô sensei" (2009) -- 13 episodes

Special 2+3:  "Zan sayonara zetsubô sensei bangai-chi" (2009-2012) -- 3 episodes (already consists of two different installments)

• You can see how overwhelming navigating this franchise can be (for fans, users, and contributors);
• Some users may not even be able to find these titles;
• A fragmented number of votes also devalues the main title, given how a proportion of ratings have been divided across five separate titles.
• IMDb TV series structure, including that of anime, indicates that they all should be merged into one.

I have tried doing precisely that but my edits were declined, which is understandable given the volume of edits that back the existence of separate seasons as distinct entities, and which will of course will need a great deal of time invested in it.Any help?Edit: is this okay that I am keeping it under "Problem," or does it belong in either one of "Question" or "Idea"?