I won't explain the rules of the community involved, that would be silly. But if we were convinced that the two people were the same, action would be taken, that's all you need to know.

If a text-analysis tool proved that the two had very similar writing styles, on a level where it was 1000-to-one that it was coincidental, then that would be considered proof.

But, having used the Fathom module, see above, I've got nothing conclusive, I'm afraid. It's a very useful tool but hasn't proven or disproven anything. There are fewer differences between two randomly-chosen posters than between Slinker and Stinker, it turns out.

Another angle of attack on this problem, which I hadn't thought of before, is mis-spellings -- Slinker has spelt "happening" as "happenning" twice, but Stinker gets it right every time...
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“Every bit of code is either naturally related to the problem at hand, or else it's an accidental side effect of the fact that you happened to solve the problem using a digital computer.” M-J D