He oughta know better: Mark Roberts and the iron spherules

On Mark Roberts’s site, a page titled They oughta know better: critiques of the inept work, absurd claims, and deceitful practices of Richard Gage, David Ray Griffin, Jim Hoffman, Steven E. Jones, Gordon Ross, Kevin Ryan, and others includes the following claim by Mark Roberts:

The “mysterious” iron spheres in WTC dust that are cited by Jones as possible evidence of thermite or thermate use, are in fact expected to form in a hot office fire.

In support of this claim, Roberts cites the very interesting paper WTC Dust Signature Report: Composition and Morphology: Summary Report, Prepared for: Deutsche Bank (PDF), prepared by the RJ Lee Group, available on an archived version of the website of the New York Environmental Law and Justice Project. But, as we shall see, this report does not actually support Roberts’s claim at all.

(P.S.: After I notified Roberts about this post, he changed the wording on his website. Below, I’ll leave my reply to the original wording intact, and then I’ll reply to the revised version in a P.S.)