The linked article is a great overview of the neocons and 9/11 from the early 1990's on.
Absolutely, positively, the neocon-Zionists were behind 9/11. Everything points to it.
The 9/11 cover-up
The failure of the 9/11 Commission
Previous false-flag operations (such as the U.S.S. Liberty)
The lies in the lead-up to the invasions of Afghanistan and Iraq and others and now Pakistan
The lies against Iran and soon China
War crimes against Lebanon and the Palestinians and especially recently against the Gazans
— all point right to the neocon-Zionists.
Some people of the Alan Sabrosky mold believe focusing on Bush/Cheney is misguided since the Sabrosky types believe the Mossad was behind the attacks. The point though is that Bush/Cheney used Zionism and was used by Zionism.
An important concept not touched upon by David Ray Griffin in his article is what's been termed "plausible deniability." The parties involved in a conspiracy are often "better served" by compartmentalization where no single party knows the full plan and where many parties know very little except that they will benefit somehow.
David Ray Griffin does though discuss how many neocons were not privy to what was going on. Of course, those who were could always feign ignorance and come off as such by putting out writings suggesting their ignorance.
You know a tree by its fruit. You know the Zionists by what they do and bring forth.