Personally, I'd prefer to hold off on speculation until more facts are in.

That being said–while I agree some of his comments and conclusions are a bit weak (particularly, how Zygier's response to Koutsoukis of Fairfax Media was a red herring–even Koutsoukis said he found Zygier's response reasonable and not like that of a guilty man: http://www.abc.net.au/lateline/content/2013/s3690870.htm), Marc's ultimate conclusion, that Zygier betrayed (or was about to betray) Israel to Australia (and not that he was an Iranian double agent, or an anti-Zionist Vanunu) is a view held by many.

Barak Ravid, in a much better argued article with fuller sources and references, essentially comes to the same conclusion:
http://www.haaretz.com/news/diplomacy-defense/israel-partially-lifts-gag-order-on-case-of-dual-citizen-s-prison-suicide.premium-1.503449#.UR0EECYUMs4.twitter

I personally think, that the extreme isolation of his detention suggests either extreme seriousness to his crime or that it was necessary to keep him isolated because of his potential behavior.

It seems that the justice system was kept informed of the detention, and a diverse group of people of high standing were convinced enough of the validity of the case against him, that the case was kept under wraps for so long. Even his attorney Avigdor Feldman has kept quiet until now. If there was an extreme travesty of justice, I think we would have heard about this earlier.

I am inclined to think, particularly given Zygier's junior standing in Mossad, that the extreme detention is less punitive and more preventive (of keeping him from contact with others), which would explain why those privy to the case, did not attempt to "spill the beans."

We have no idea about Zygier, and to what extant he was compromised or how.

I am curious to know: Zygier's death–was it suicide? Aside from the extreme difficulty of suicide in a "suicide proof" cell, Avigdor Feldman found him in a reasonable state days before his death. What happened?

While there must be some fire beneath the smoke to get Mossad fired up I find it a stretch that anything presented here substantiates, or even implies wrong doing.

Just to balance things out I propose that Zygier death was faked as part of a Mossad plot to establish a new identity for a high value agent.

This affair goes back to Mr. Dagan's days, perhaps in time somebody.
will talk, it took tears before Lavon resigned, and with the debacles of 1973,
or the "job" in Lilihammer, Norway, few took responsibility.
Did the M.I chief who betrayed the Egyptian double agent who "fell off".
the building in London, ever account for his betrayal?
Meantime, the wife is out of reach, she has parents, who are they?
I am not sure the Israeli media is doing much work other than.
feed off overseas gossip…on the "second anniversary" of this.
platform perhaps the renowned and celebrated Mr. Horowitz
will concentrate on serious journalism which is still in vogue,
not extrapolating bits of data from the Guardian-U.K, The Age, etc..
This no way to run a legit outfit, what gives the entity a reputation is.
in house developed stories. There is no doubt in my.
mind that serious students of journalism could do some.
research on the internet and come up with material.
that is similar or nearly as good, why bother with staff.
reporters if the idea is to feed on others' stories?

Absolutely and I don't claiim that it's anything else, I don't think that there is anything wrong with speculation on this, I think everyone already is, has been and will be speculating on it for a long time to come and I simply blogged my take on it.