Bacon King is, by himself, a more credible source than any German newspaper on issues regarding Greece.
No, that's not how an argument works. The burden of proof is on someone who contests the validity of what is the prevailing viewpoint, not on the person presenting the mainstream view.
When one "questions" something, they are the ones who have to disprove it, because the implication is that whatever is being questioned is already assumed to be true.
This is a weird rule to follow because every side in a debate should be required to back up their argument with facts if requested/contested and you shouldn't get a free pass for claiming to be speaking for conventional wisdom
some sources for my previous post:
Greek-Swiss Treaty: Athens Closes in on Wealthy Tax Evaders (Spiegel, August 2012)Greek-Swiss tax deal remains elusive (Reuters, Feb 2014)