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Both of those are bunk. Yuri's comments is based entirely on her point of view, which is increasingly shown to be wrong. She may have some good insite on how the world operates, but she doesn't understand everything.
My personal theory is that people move on when they no longer dwell on or come to terms with the "unfairness" of their life. This was shown with Iwasawa's disappearance, which is the only case we actually see someone move on. Hinata may have disappeared since catching the pop-fly would have helped him come to terms with his failure to do so when he was alive.
Yuri and Ōyama behaved liked normal students at first and neither of them disappeared during that time. We really don't know how long either of them were there, but apparently Yuri was there long enough to figure out that most of the students and the teachers weren't real humans. Hinata didn't have a chance to behave like a model student as Yuri' roped him in and started her rebellion right after he arrived.
Following the model students may help most people come to terms with their past lives. However, every once in a while, there is a "hard case" that isn't able to move on. I believe that Kanada is one of those hard cases.
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