To be frank, no liguistic analysis solution would be MEANINGFUL and HELPFUL in this case, doesn't matter whether we have a good liguistic analysis solution.

Think about this at a higher level, and don't sink into technical details too quick. This is actually a good example where TECHNOLOGY does not help with SOCIAL issues.

Think about this, whatever how prefect the analysis tool is, it would require a big amount of input to yield any MEANINGFUIL result. The reality is that, if Slinker behaves in the same way as Stinker, doesn't matter whether they are one person, most likely, long before your tool give you any MEANINGFUL result to JUSTIFY your decision, you have banned Slinker already.

On the other hand, if Slinker behaves better, even your nice liguistic analysis tool figures out that Slinker is Stincker, there is still no JUSTIFIED reason for you to ban him. In this case, the only thing a technically capable tool does is, to create negative social feeling.

Summary:

	Slinker behaves bad	Slinker behaves good (I cannot use the word "better" here, as that is logically wrong unless Stinker is in fact Slinker)
Analysis tool says S == S	Takes large amount of data to analysis, most likely, your emotion would help you to make a decision much quicker	Yes, he is the same person, but you don't have a reason to ban him, the revelation only affects everyone's feeling in a negative way
Analysis tool says S != S	Stinker still would be banned, doesn't matter whether the result from your tool is correct, your bad feeling would take care of this	Too obvious, the analysis is totally a waste of time

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