These are not the issues at all.
The case was investigated and dismissed by the Swedish police.
It was pressure from the US that cause it to be revived, but only when it was handed over to a different prosecutor.
My understanding was one of the alleged victims lawyers appealed to the appeal court who reopened the case, of course she could have been a plant, induced or otherwise coerced as could the various public officials involved.
In fact, because the extradition is to Sweden, no prima facie need be made. But the US will, apparently, be able to ask for his extradition on the secrets charges, from Sweden.
I believe that that is part of the EAW set up, essentially we have "pre-vetted" a bunch of countries and all agreed that their police, judiciary and legal systems are such that we can rely on their decision for extradition. Sweden is generally regarded as very incorrupt, in fact many indices put it above the UK.
In answer to your question, if the details are the same then it should matter whether it is Joe Bloggs or Assange. Both should raise our suspicions.
Going to disagree with you there, for similar conditions the cases must be treated the same. If JB/JA's defence against extradition is that there is a secret plot to extradite him to the US then it should be explored in his appeals.
There is a "statutory bar" against extradition for "extraneous considerations" (whether the request for extradition is improperly motivated) which would seem to fit the bill for JA's defence. It's up to JB/JA to show that the request is improperly motivated. I would assume that is what JA's legal team tried. They failed on appeal and appeal to the supreme court, so twice.
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We only have circumstantial evidence (some Americans, many of whom aren't even in a position to make decisions, e.g. Palin have called for his arrest), talk of secret deals and JA's assertion this is political and he'll be extradited onwards. Of course you an always spin "secret deals" with (by definition)
scant evidence. But there has been no official request for JA to either the UK or Sweden.
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If the UK wanted to arrest and question someone in Sweden and that person demanded that the uk police travel to Sweden rather than follow usual procedure, the answer would be "tough, those are the rules".
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I would have found myself being a lot less sympathetic if there had not been such a vociferous campaign of vilification of the guy. Even, at one point, attempting to claim he wasn't a real journalist, because he doesn't work for a recognised publication! (Wikileaks not withstanding, presumably.

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I think the outcome is obvious. He will eventually leave or be forced out of the Embassy. He will be sent to Sweden where he will be quickly cleared and immediately sent to the US. From there he will almost certainly vanish from view with a few lurid claim about his sex life until eventually he gets murdered by another inmate.
If the US were really clever, they'd let JA got to Sweden, maybe he's innocent, maybe he's guilty, from the US point of view not guilty but with lots of juicy sleaze coming out is the outcome.
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then they do nothing. Then it looks like JA's a d-bag who uses his fame to try and avoid the consequences of his acts. Reputation ruined, all his supporters let down and drift away.
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Right now though he appears to be voluntarily detaining himself.
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(btw I agree about the press campaign against him being rather harsh)