I can't say for others, but the confusion I saw myself was because I saw this being referenced in other maps by BNs like in the link in my earlier post p/3772733Spy wrote:
Nobody said 1.5 stars gap is unrankable.Paulmrm wrote:
Aren't SR gaps wider than 1.5 stars unrankable? The gap between Insane's star rating and Ex-ray's is 1.87.
In addition, and I know others can say as well, but I distinctly remember the shi-ren trello saying "1.5+ star gap between diff = unrankable" in its ranking criteria page. Yes, I know it's not official documentation, and said documentation is gone now, but that page was referenced a lot many times in the past by many as a quick summary of ranking criteria that applies to mania only.
In any case, this has been cleared up so I don't think there's anything further to say about this.