First off I cannot comment on the credibility of the article posted, however the girls mentioned by the people on 2ch are girls that live dangerously close to being legit candidates for graduation, solely because they are not at all popular these days.
Umechan has done well in elections, and is a good captain. It seems unlikely that she would go.
As for Miichan, she has been given ultra special treatment, and if she graduates I would be surprised. Can Kojimako make senbatsu? I am quite sure of it, and I would be surprised if she doesn't do it soon. Really. And if that's what Miichan needs to graduate, she won't be in the group for much longer.
Amina has always walked a difficult and slippery uphill road - no matter how hard she has worked, and no matter how fans respond (positively), management just hasn't rewarded any of the hard work, for whatever reason. She has never gotten a breakthrough with mainstream/casuals, which is unfortunate, because she has always had the backing of the core fans. Now, her main problem that has irked her core fans, is her weight. It's a touchy subject but idols who are overweight lose popularity almost immediately. It seems that in these days however, she has lost a lot of weight, and her style is returning to her 2008 style - which was fantastic. She got a lot of praise in a recent thread on 2ch for this, but as someone said in reply: "Too late...", and it really is - because she killed her popularity with the core fans after her scandal that she shared with Chikarina. And that really is why she dropped from figures such as 17/20, 18/20 etc. to 0/16. When management dislike you when you pretty much sell out all your slots, how do you think management will be when you don't sell out anything?
And Myao has pretty much lost it all. I honestly put her in the group of girls that are hopeless. Not because I dislike her, but because a resurrection of her career would be nothing short of a miracle. If she doesn't want to graduate, then at one point management will probably tell her to do so.
Harukyan's position I don't understand. She's funny and entertaining, and it's just weird seeing her so low, but unfortunately this happens with many girls who have a lot to contribute with but just doesn't get through.
Some of the girls in that "Bottom 20" list are incredibly obvious, and these are girls that do terrible in handshake events, barely get to appear in theater, and aren't found anywhere else. So how is this a good situation?
Much speculation, but the hard cold facts is that some girls are barely visible, and when they are, few seem to care. And it saddens me because virtually all girls in the 48 groups have something unique to offer.