Was 'Prisoner X' the whistleblower on the Dubai assassination?

'b' asks; 

"...On January 19 2010 Mossad operatives assassinated the Hamas commander Mahmoud Al-Mabhouh in a hotel in Dubai. The police in Dubai used videos and stills from various security cameras (part 1, 2, 3) to stitch together the evidence and to identify the Mossad agents involved. The agents involved used passports from various countries including Australian passports though none with the name of Ben Zygier or Ben Alon.In December 2010 his always wrong "source" told Richard Silverstein that Prisoner X was a Iranian Revolutionary Guard General abducted by Mossad. (UPDATE from Silverstein, here)If Ben Zygier (photo) was indeed involved with Mossad and ended up as "Prisoner X" he must have done something very extraordinary. Did he blow the whistle about the Dubai assassination? One wonders when we will learn what he did. ..."