Deport to Sweden then deport to the USA was the scheme Assange was afraid of IIRC. Something about Sweden having a stronger deportation treaty than the UK...
As evidenced by the "Cablegate" leak, it's more the fact that when the US government tells the Swedish government to jump, the latter asks "how high?" like a trained fucking poodle.
Link the leak? In this case, extraditing to Sweden on a wholly unrelated charge than to extradite to the US seems like a thing Sweden would not want because it would have hurt their credibility in future extraditions. All speculative now, ofc.
Regardless of which side is in power.